13.72x0.25+6.28/4用简便算法求你了! 告诉我

13.72x0.25+6.28/4用简便算法求你了! 告诉我
13.72x0.25+6.28/4用简便算法
求你了! 告诉我

13.72x0.25+6.28/4用简便算法求你了! 告诉我
13.72*0.25+6.28/4
=13.72*0.25+6.28*0.25
=(13.72+6.28)*0.25
=20*0.25
=5

先乘以4
（13.72x0.25+6.28/4）*4=13.72+6.28=20
然后除以4
20/4=5