[(35%-1/10)除以2又1/2-3又1/5] - 知识问答

[(35%-1/10)除以2又1/2-3又1/5]除以3.1-4.简便计算啊

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(35%-1/10)除以2又1/2-3又1/5]除以3.1-4
=[1/4 * 2/5 - 16/5] * 10/31 -4
=-1-4
=-5
[9991*1999(1.0001)+1999*9991*1.0001]/2.0002
=(10000-9)*(2000-1)
=20000000-18000-10000+9
=19972009

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