0.01分之0.2(0.2-x) +1.2x=0.12+20x

0.01分之0.2(0.2-x)是一项 +1.2x是一项 0.12+20x是一项

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即冲轮燃散虚桐咐20(0.2-x)+1.2x=0.12+20x
4-20x+1.2x=0.12+20x
20x+20x-1.2x=4-0.12
38.8x=3.88
x=3.88÷38.8
x=0.1

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