作业帮0.3x-x乘以0.25=21.15-7x
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0.3x-x乘以0.25=21.15-7x
0.3x-x乘以0.25=21.15-7x
0.3x-x乘以0.25=21.15-7x
0.3x-x乘以0.25=21.15-7x
0.05x+7x=21.15
7.05x=21.15
x=3
30x-25x=2115-700x
5x=2115-700x
705x=2115
x=2115/705
x=3
0.3x-x×0.25=21.15-7x
(0.3-0.25+7)x=21.15
7.05x=21.25
x=3
0.3x-x乘以0.25=21.15-7x
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