0.4X-(0.6X/12)*5=30 怎么解
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0.4X-(0.6X/12)*5=30 怎么解
0.4X-(0.6X/12)*5=30 怎么解
0.4X-(0.6X/12)*5=30 怎么解
0.4X为2/5X 括号里的化简得1/20X 2/5X-1/20X=7/20X 7/20X=30
X=600/7