Question

9.9乘26简便计算

Answer 1

9.9×26
＝（10-0.1）×26
＝10×26-0.1×26
＝260-2.6
＝257.4

追问

2.87乘60呢

Answer 2

9.9×26
=(10一0.1)×26
=10×26-0.1×26
=260-2.6
=257.4

Answer 3

。

Answer 4

（10-0.1）×26

追答

用分配律

=10×26+0.1×26

=262.6

Answer 5

（10-0.1）×26