巧算(1/110*2.1*0.54*55)/54*0.21*4又1/2
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巧算(1/110*2.1*0.54*55)/54*0.21*4又1/2巧算(1/110*2.1*0.54*55)/54*0.21*4又1/2巧算(1/110*2.1*0.54*55)/54*0.21*
巧算(1/110*2.1*0.54*55)/54*0.21*4又1/2
巧算(1/110*2.1*0.54*55)/54*0.21*4又1/2
巧算(1/110*2.1*0.54*55)/54*0.21*4又1/2
(1/110*2.1*0.54*55)/54*0.21*4又1/2
=(55×1/110)×(0.54/54)×(2.1/0.21)×4.5
=1/2×0.01×10×4.5
=0.225
利用乘法交换律和结合律,化简一下。我理解题目是这样:
(1/110*2.1*0.54*55)/(54*0.21*4又1/2)
=(55/110)*(21/21)*(54/.54)*(2/.90) 分子分母扩大1000倍
=(1/2)*1*1*(1/45)
=1/90
巧算(1/110*2.1*0.54*55)/54*0.21*4又1/2
110分之1乘2.1乘0.54乘55分之54乘0.21乘0.
算式:(54乘0.12乘4又5分之1)分之(110分之1乘2.1乘0.54乘55)(要竖式,要简便.)
巧算:716-155+55
2200÷55巧算
巧算:716-155+55
巧算:(10-7/55*1)+(9-7/55*2)+(8-7/55*3)……(1-7/55*10
巧算:(10-7/55*1)+(9-7/55*2)+(8-7/55*3)+.+(1-7/55*10)
巧算( 10- 乘1)+ (9-55分之7 乘3) 加(8-55分之7乘10)
5+55+555+5555+...+5555555555=巧算
巧算 (350+115+55)/5
简算55×102-110
解方程,0.54x-(1-0.54)x=80
55*102-110 简便算法
55*102-110 简便计算
巧算!
巧算,
54乘0.21乘4又1/5分之1/110乘2.1乘1.54乘5.5=?简便计算