75-(6.8+0.32*0.25*12.5)怎么简便运算?

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75-(6.8+0.32*0.25*12.5)怎么简便运算?
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75-(6.8+0.32*0.25*12.5)怎么简便运算?
75-(6.8+0.32*0.25*12.5)怎么简便运算?

75-(6.8+0.32*0.25*12.5)怎么简便运算?
75-(6.8+0.32*0.25*12.5)
=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-[6.8+1]
=75-7.8
=67.2

一楼出错了.应该是:75-(6.8+0.4*2.5*0.8*1.25)