• 五点七乘九点九加零点五七怎样简算
• 零点七五乘九点九的简便运算
• 5点8*9点9简便运算
• 5/7-5/9*5/7简便运算

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