5/4*3.5+5.5*80%+4/5 用简便方法 - 知识问答

5/4*3.5+5.5*80%+4/5 用简便方法计算

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5/4*3.5+5.5*80%+4/5
=5/4*3.5+5.5*4/5+4/5
=5/4*3.5+(5.5+1)4/5
=(5/4)(7/2)+(13/2)(4/5)
=35/8+26/5
=175/40+208/40
=383/40

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