630-x+2/5x=4x等于?
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630-x+2/5x=4x等于?630-x+2/5x=4x等于?630-x+2/5x=4x等于?630-x+2/5x=4x630-3/5x=4x4x+3/5x=63023/5x=630x=630*5/
630-x+2/5x=4x等于?
630-x+2/5x=4x等于?
630-x+2/5x=4x等于?
630-x+2/5x=4x
630-3/5x=4x
4x+3/5x=630
23/5x=630
x=630*5/23
x=3150/23
x=140
630-x+2/5x=4x等于?
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