■ Hello School 数学(ハロ数) Ver.2 中1 方程式の解き方 練習問題 ■ |
インターネット上で中学校の数学を勉強できるよ。 |
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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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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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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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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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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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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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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+0.7.6
(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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12.次の方程式を解きなさい。
(3) -3x+ |
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14.次の方程式を解きなさい。
(1) 2x+3 |
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(2) -3x+4 |
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(3) -7x+2 |
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(4) x−5 |
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(5) -5x+9 |
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(6) -x−3 |
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(7) -9x+6 |
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(8) 5x+2 |
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(9) 7x+2 |
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(10) 4x− |
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15.次の方程式を解きなさい。
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(3) |
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(6) -0.2x−0.3 |
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(7) 0.8x+0.4 |
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(8) -0.3x−0.7 |
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(9) 0.2x+0.9 |
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(10) -0.125x−0.25 |
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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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(5) |
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(7) 0.24 |
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(9) 0.8 |
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−0.4 |
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(10) |
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17.次の方程式を解きなさい。
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(3) 3−[3x+3{11x−4(3x+1)}]:17+[-6x−2{3x−(6x−1)}]=3(x−2):4(2x+1)
(4) 160+[-24x−4{x−7(x−5)}]:-145−[3x+5{2x−7(x−9)}]=4(2x+5):3(3x−1)
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(6) |
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(7) 2:1=0.75 |
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(8) 2.5:1.6=0.6 |
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(9) |
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(10) |
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解答と解説 |
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商用目的での利用を固く禁じます。 |