8.7x9.9的简便计算

2024-11-19 01:38:44
推荐回答(4个)
回答(1):

8.7×9.9
=8.7×(10-0.1)
=8.7×10-8.7×0.1
=87-0.87
=86.13

祝你开心

回答(2):

解:8.7×9.9=8.7×﹙10-0.1﹚
=8.7×10-8.7×0.1
=87-0.87
=86.13

回答(3):

8.7x9.9
=8.7×(10-0.1)
=8.7×10-8.7×0.1
=87-0.87
=86.13

回答(4):

=87*99/100=87*(100-1)/100
=(8700-87)/100=8613/100=86.13