Question

小学数学简便运算

41.2*8.1+11*1.25+53.7*1.9这道题的简便方法

Answer 1

由题可见：8.1和1.9可以凑整，所以：

原式=41.2*8.1+11*1.25+（41.2+12.5）*1.9

然后1.25和12.5又可以简便，所以：

原式
=41.2*8.1+11*1.25+（41.2+12.5）*1.9
=41.2*（8.1+1.9）+12.5*（1.1+1.9）
=412+37.5
=449.5

100%对！！！！！！！

Answer 2

41.2*8.1+11*1.25+53.7*1.9
=41.2*(8+0.1)+(10+1)*1.25+53.7*(2-0.1)
=329.6+4.12+12.5+1.25+107.4-5.37
=449.5

Answer 3

=41.2*(8.1+1.9)+12.5*1.9+11*1.25
=41.2*10+(1.9*10+11)*1.25
=412+30*1.5
=412+45
=457