5点7×9点九用简便计算? 900 25用简便方法计算
更新时间:2021-10-08 18:44:44 • 作者:RON •阅读 5786
五点七乘九点九加零点五七怎样简算
=5.7*9.9+0.57
=5.7*9.9+5.7*0.1
=5.7*(9.9+0.1)
=5.7*10
=57
零点七五乘九点九的简便运算
0.75×9.9
=0.75×10-0.75×0.1
=7.5-0.075
=7.425
5点8*9点9简便运算
5.8*9.9=5.8*(1-0.1)=5.8-0.58=5.22
5/7-5/9*5/7简便运算
5/7-5/9*5/7
=5/7*(1-5/9)
=5/7*4/9
=20/63