9.9×9.9简便计算

Question

9.9×9.9简便计算

Answer 1

9.9×9.9
= 9.9 x (10 - 0.1)
= 9.9 x 10 - 9.9 x 0.1
= 99 - 0.99
= 98.01
运用乘法分配律

Answer 2

9.9×9.9
=9.9×(10-0.1)
=9.9×10-9.9×0.1
=99-0.99
=98.01本回答被网友采纳

Answer 3

原式等于（10-0.1）²=98.01
~回答完毕~
~\(^o^)/~祝学习进步~~~

Answer 4

9.9×9.9
=9.9×(10-0.1)
=9.9×10-9.9×0.1
=99-0.99
=98.01

Answer 5

9.9×9.9 =9.9×(10-0.1) =9.9×10-9.9×0.1 =99-0.99 =98.01