75-(6.8+0.32*0.25*12.5)怎么简便运算?
1个回答
=75-(6.8+0.4*0.8*0.25*12.5)
=75-[6.8+(0.4*0.25)*(0.8*12.5)]
=75-(6.8+0.1*10)
=75-7.8
=67.2
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