8.7×9.9用简便运算怎么做?

2024-11-26 04:37:40
推荐回答(5个)
回答1:

8.7×9.9用乘法分配律简算
=8.7×﹙10-0.1﹚=8.7×10-8.7×0.1=87-0.87=86.13

回答2:

8.7x(10一0.1)
=8.7x10一8.7x0.1
=87—0.87
=86.13

回答3:

8.7X10-0.87=87-0.87=86.13

回答4:

8.7ⅹ9.9
=8.7x(10-0.1)
=8.7x10-8.7x0.1
=87-0.87
=86.13

回答5:

8.7X10-0.87