不记得怎么解了） 5/3X × 20% - X × - 知识问答

不记得怎么解了） 5/3X × 20% - X × 25%

3个回答

(5/3)X × (20%) - X × (25%)
= (5/3)X × (1/5) - X × (1/4)
= (1/3)X - (1/4)X
= [ (1/3) - (1/4) ]X
= [ (4/12) - (3/12) ]X
= (1/12)X
= X/12 .

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