简便运算25*3/4-(-25)*1/2-25*1/4= -99又17/18*9=
题目
简便运算25*3/4-(-25)*1/2-25*1/4= -99又17/18*9=
答案
25*3/4-(-25)*1/2-25*1/4=25(3/4+1/2-1/4)=25(3/4-1/4+1/2)=25(1/2+1/2)=25
-99又17/18*9= (1/18-100)*9=1/2-900=-899.5
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