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5点7×9点九用简便计算? 900 25用简便方法计算

5点7×9点九用简便计算?900 25用简便方法计算

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