3/5x-1/6=2/3 2x+0.8=4 0.4x(x-1.2)=1.2 10/9x-1/3x=21 3/4x-1/2=1/4 _数学解答

3/5x-1/6=2/3 2x+0.8=4 0.4x(x-1.2)=1.2 10/9x-1/3x=21 3/4x-1/2=1/4 5(x-2.8)=140 x-3/7x=8/21
3/5x-1/6=2/3
2x+0.8=4
0.4x(x-1.2)=1.2
10/9x-1/3x=21
3/4x-1/2=1/4
5(x-2.8)=140
x-3/7x=8/21
方程和计算

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解答

3/5x-1/6=2/3 2x+0.8=43/5x-1/6+1/6=2/3 +1/6 2x=4-0.83/5x=2/3 +1/6 x=1.6 3/5x=5/6 3/5x÷3/5=5/6÷3/5x=1/20.4x(x-1.2)=1.2x-1.2=3x=3+1.2x=4.210/9x-1/3x=21x=21x9/7x=273/4x-1/2=1/4 3/4x-1/2+1/2=1/4+1/2 3/4x...