重庆科技学院李敏老师:4.7*3.56+2.5*3.56+6.44*7.2(简便运算)
来源:百度文库 编辑:高校问答 时间:2024/05/09 04:27:13
4.7*3.56+2.5*3.56+6.44*7.2
=(4.7+2.5)*3.56+6.44*7.2
=7.2*3.56+6.44*7.2
=7.2*(3.56+6.44)
=7.2*10
=72
(4.7+2.5)*3.56+6.44*7.2
7.2*(3.56+6.44)
7.2*10
72
4.7*3.56+2.5*3.56+6.44*7.2
=(4.7+2.5)*3.56+6.44*7.2
=7.2*3.56+6.44*7.2
=7.2*(3.56+6.44)
=7.2*10
=72