Question

简便计算下面题目？

41.2*5.5+53.7*4.5+5*1.25

Answer 1

41.2×5.5+53.7×4.5+5×1.25
=(41.2+53.7)×（5.5+4.5）+5×1.25
=94.9×10+5×1.25
=949+5×(1+0.25)
=949+5×1+5×0.25
+949+5+1.25
=954+1.25
=955.25

追问

方法好像不对哦！

Answer 2

41.2*5.5+53.7*4.5+5*1.25
=41.2*(5+0.5)+53.7*(5-0.5)+5*1.25
=41.2*5+41.2*0.5+53.7*5-53.7*0.5+5*1.25
=5*(41.2+53.7)+0.5*(41.2-53.7)+5*1.25
=5*94.9-0.5*12.5+5*1.25
=5*94.9-5*1.25+5*1.25
=5*94.9
=474.5

Answer 3

=5*（41.2+53.7+1.25）-0.5*（53.7-41.2）
=5*（41.2+53.7+1.25）-0.5*12.5
=5*（41.2+53.7）
=5*94.9=5*（100-5-0.1）
=500-25-0.5=574.5

Answer 4

这道题感觉简便计算的过程还不如直接计算。
41.2*5.5+53.7*4.5+5*1.25=474.5

Answer 5

简便计算方法如下：41.2x5.5+53.7x4.5+5x1.25
=226.6+241.65+6.25
=226.6+247.9
=474.5