■ Hello School 数学(ハロ数) Ver.2 中1 1次不等式(計算) 練習問題 解答と解説 ■ |
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1.次の方程式を解きなさい。
(1) 6x+6≦12(x−3) (2) 2(3x+15)≧3(x−1) (3) 3(x+1)−(-x−5)
<40
(4) 5x−(7x−26)−3(x+2) < 0 (5) 6x−(-2x+3)≦4(x+1)−2x−25 (6) 2x−3{x−(4x+1)}≧25
(7) -7x+2{3x−2(x+7)}≦4{3(x+1)−2(3x−2)} (8) 2x−1≦57−3[x−{−(6−x)+4x}]
(9) 3{2x−3(x−1)}+78≦3[-4x−2{-6x−(x−2)}] (10) 2[x−4{3x−5(x+1)}]
> -3[2x−3{2x−6(x−2)}]−8
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解答:(1) x≧7 (2) x≧-11 (3) x<8 (4) x>4 (5) x≦-3
(6) x≧2 (7) x≦8 (8) x≧-4 (9) x≧3 (10) x>1 |
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2.次の方程式を解きなさい。
(1) 0.2x+1≧0.6x−1 (2) 3.4x−0.6 > 1.8x+2.6 (3) 0.2(3x−8)≧-0.7x−0.3
(4) 0.3(0.2x−0.4) < 0.3 (5) 0.1(3x−5)−0.4≧3(1.4x+1) (6) 3(0.5x−0.2)−0.8(3x−5)
> 2−0.8(x−3)
(7) -0.3(2x−4)+0.2(x−2) < 2 (8) 0.5(2x−3)−6 > 0.2(4x−3)−0.3(x−2)
(9) 0.3−{0.2(x+1)−0.6x}≧=0.5x−0.3 (10) 0.6x−0.8≦0.9x−[0.6−{x−(0.7x−0.4)}]
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解答:(1) x≦-5 (2) x>2 (3) x≧1 (4) x<7 (5) x≦-1
(6) x<-10 (7) x>-3 (8) x>15 (9) x≦4 (10) x≧-1 |
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3.次の方程式を解きなさい。
(1) -0.3x−2≧-0.9x+10 (2) 1.4x−0.7≦-1.4x−17.5 (3) 0.9(2x−5)≧-0.8x−1.9
(4) 0.4(0.6x−0.1) > 1.4 (5) 0.2(2x−3)−1.4≦4(1.6x+4) (6) 5(0.7x−0.1)−0.3(8x−7)
> 7−0.2(2x−3)
(7) -0.7(3x−4)+0.3(2x−1)≧7 (8) 0.3(3x−5)−0.1≦0.7(3x−7)−0.5(3x−3)
(9) 0.7−{0.3(x+3)−0.5x} > 0.4x−0.6 (10) 0.7x−2≦0.8x−[1.1−{x−(0.5x−0.9)}]
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解答:(1) x≧20 (2) x≦6 (3) x≧1 (4) x>6 (5) x≧-3
(6) x>4 (7) x≦-3 (8) x≦-6 (9) x<2 (10) x≧-3 |
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4.次の方程式を解きなさい。
(1) 0.6x+2≧1.4x−6 (2) 2.1x−1.9 < 1.8x+0.8 (3) 0.7(5x+2)≦-0.8x−2.9
(4) 0.2(0.8x−0.3) > 0.9 (5) 0.9(x−3)−0.2≦=4(0.2x−0.7) (6) 2(0.7x−0.3)−0.6(2x−3)≧13−0.5(3x−7)
(7) -0.4(3x−1)+0.3(x−4)≧-8 (8) 0.8(3x−2)−8.3 > 0.3(6x−5)−0.4(x−9)
(9) 0.4−{0.9(2x−3)−0.3x}≧-0.3x−0.5 (10) 0.2x−0.5≦0.7x−[2.1−{0.8x−(2.3x−3.6)}]
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解答:(1) x≦10 (2) x<9 (3) x≦-1 (4) x>6 (5) x≦1
(6) x≧9 (7) x≦8 (8) x>12 (9) x≦3 (10) x≦2 |
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5.次の方程式を解きなさい。
(1) -0.5x−7≦-0.7x−9 (2) 3.8x−5.4 > 2.4x+1.6 (3) 0.3(7x−2)≧-5.9x+15.4
(4) 1.2(0.4x−0.1) > 0.36 (5) 0.8(x−6)−3.4≦7(0.5x−0.4) (6) 8(0.1x−0.3)−0.4(6x−1)≦−0.9(2x−6)
(7) -1.6(-6x−1)+1.8(3x−7) < 19 (8) 0.7(4x−4)−1≧3.4(2x−6)−4.2(x−1)
(9) 0.6−{0.6(6x−6)−0.1x}≦0.5x+0.2 (10) 0.8x+1.4≧0.9x−[3.1−{0.2x−(1.6x−1.9)}]
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解答:(1) x≦10 (2) x>5 (3) x≧2 (4) x>1 (5) x≧-2
(6) x≦37 (7) x<2 (8) x≧-62 (9) x≧1 (10) x≧-2 |
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6.次の方程式を解きなさい。
(1) 4.2x−3 < 1.2x−15 (2) 5.4x−1.3 > 4.6x−3.7 (3) 3.8(0.7x−0.9)≧-0.59x−0.17
(4) 6.7(0.4x−0.5)≦-0.32x−0.35 (5) 2.7(2x−1)−1.8≦9(0.3x−0.2) (6) 7(0.8x−1.3)−0.3(8x−7)≦5−0.8(4x−1)
(7) -9.2(4x+3)−4.1(2x−6)≦17−6.5(2x+8) (8) 0.9(4x−1)−3 <
0.6(6x−1)−0.3(x−1)
(9) 0.8−{0.5(3x−5)−0.4x} > =0.3x+0.5 (10) -1.4x−0.4 <
0.2x−[3.1−{0.4x−(2.9x−4.5)}]
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解答:(1) x<-4 (2) x>3 (3) x≧1 (4) x≦1 (5) x≦1
(6) x≦2 (7) x≧1 (8) x<12 (9) x< 2 (10) x<2 |
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7.次の方程式を解きなさい。
(1) 2.6x+3≧5.2x−10 (2) 3.8x−7.1 < 3.4x+9.3 (3) 4.6(0.3x−0.4)
> 0.08x+0.76
(4) 5.4(0.7x−0.6)≦-2.4x+2.94 (5) 3.2(3x+8)−14≧7(0.8x−1.2) (6) 4(0.9x−0.4)−0.7(2x−3)
< 4−0.9(2x−5)
(7) -2.1(6x−1)+4.3(4x+3) > 8−3.4(x+5) (8) 0.7(2x−3)−0.3
> 0.9(2x−3)−0.5(2x−3)
(9) 0.3−{0.4(7x−3)−0.3x}≧0.2x−1.2 (10) 0.8x+1.5 > 0.1x−[4.3−{0.2x−(1.6x−3.7)}]
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解答:(1) x≦5 (2) x<41 (3) x>2 (4) x≦1 (5) x≧-5
(6) x<2 (7) x>-3 (8) x>2 (9) x≦=1 (10) x>-1 |
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8.次の方程式を解きなさい。
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解答:(1) x≧9 (2) x≦- |
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(3) x>7 (4) x≧6 (5) x<-1 |
(6) x≧2 (7) x> |
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(8) x≧-4 (9) x<-6 (10) x>-6 |
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9.次の方程式を解きなさい。
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解答:(1) x≧4 (2) x≦5 (3) x<-1 (4) x≧4 (5) x>13
(6) x≧6 (7) x≦1 (8) x>-1 (9) x>-20 (10) x≦3 |
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10.次の方程式を解きなさい。
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解答:(1) x≧-13 (2) x> |
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(3) x≦1 (4) x≧ |
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(5) x<- |
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(6) x> |
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(7) x≦11 (8) x<-38 (9) x< |
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(10) x≧ |
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11.次の方程式を解きなさい。
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解答:(1) x≧17 (2) x≦-63 (3) x≦5 (4) x<89 (5) x≦ |
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(6) x<2 (7) x≦- |
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(8) x<57 (9) x>61 (10) x≦ |
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12.次の方程式を解きなさい。
(3) -3x+ |
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≦ |
− |
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(4) x+ |
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< |
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+ |
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解答:(1) x≦ |
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(2) x≧- |
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(3) x≧ |
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(4) x<- |
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(5) x≦- |
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(6) x<3 (7) x≧-10 (8) x> |
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(9) x≧-28 (10) x>12 |
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13.次の方程式を解きなさい。
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解答:(1) x≦4 (2) x≦ |
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(3) x≧1 (4) x<- |
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(5) x≦4 |
(6) x>- |
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(7) x>- |
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(8) x≧4 (9) x≦ |
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(10) x> |
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14.次の方程式を解きなさい。
(1) 2x+3 |
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x− |
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(2) -3x+4 |
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2x− |
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≧ |
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(3) -7x+2 |
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3x− |
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≧ |
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(4) x−5 |
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6x+ |
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(5) -5x+9 |
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x− |
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(6) -x−3 |
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-x− |
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≧- |
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(7) -9x+6 |
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3x+ |
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> |
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(8) 5x+2 |
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-2x− |
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< |
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(9) 7x+2 |
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-3x− |
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≦ |
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(10) 4x− |
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-4x− |
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> |
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解答:(1) x>-5 (2) x≧1 (3) x≧ |
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(4) x>-1 (5) x>- |
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(6) x≦ |
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(7) x>- |
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(8) x<8 (9) x≧27 (10) x> |
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15.次の方程式を解きなさい。
(1) |
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− |
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x− |
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≧ |
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(2) |
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− |
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2x− |
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≦ |
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(3) |
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+ |
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-4x− |
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> |
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(4) |
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− |
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4x− |
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≦ |
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(5) |
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− |
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-2x− |
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(6) -0.2x−0.3 |
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-3x− |
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≧ |
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(7) 0.8x+0.4 |
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8x+ |
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(8) -0.3x−0.7 |
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-2x− |
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(9) 0.2x+0.9 |
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8x− |
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(10) -0.125x−0.25 |
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-2x− |
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≦ |
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解答:(1) x≦- |
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(2) x≧ |
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(3) x=< |
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(4) x≦4 (5) x<-12 |
(6) x≧ |
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(7) x<- |
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(8) x≦ |
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(9) x> |
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(10) x≧ |
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16.次の方程式を解きなさい。
(3) |
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−0.3(4x−3) |
≦ |
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−0.7(x+8) |
(4) |
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+3+2 |
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−x− |
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−3 |
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} |
< |
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(5) |
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− |
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[ |
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{ |
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− |
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( |
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− |
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} |
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≧ |
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(7) 0.24 |
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−0.25(11−19x) |
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− |
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(8) |
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[ |
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{ |
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− |
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− |
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} |
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≦ |
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{ |
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− |
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( |
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− |
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} |
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(9) 0.8 |
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{ |
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+0.75 |
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− |
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>0.8 |
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−0.4 |
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+ |
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(10) |
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0.625 |
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− |
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− |
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} |
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解答:(1) x≦- |
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(2) x> |
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(3) x≦-12 (4) x> |
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(5) x≦ |
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(6) x≧-4 |
(7) x>- |
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(8) x≧- |
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(9) x<- |
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(10) x≦ |
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解説ページ |
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