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数学
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[+1.25]x[-81/20]x[-8]怎样用简便方法算?
人气:222 ℃ 时间:2020-05-18 06:46:44
解答
把小数写成分数,并判断结果的符号
[+1.25]x[-81/20]x[-8]
=5/4*81/20*8
=(5*81*8)/(4*20)
=81/2
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