问题 解答题

怎样算简便就怎样算.

12.5×8.88

1.9+19.9+199.9+0.3

10.01×101-10.01.

答案

①12.5×8.88

=12.5×(1.11×8)

=(12.5×8)×1.11

=100×1.11

=111

②1.9+19.9+199.9+0.3

=1.9+19.9+199.9+0.1+0.1+0.1

=(1.9+0.1)+(19.9+0.1)+(199.9+0.1)

=2+20+200

=222

③10.01×101-10.01

=10.01×(101-1)

=10.01×100

=1001

问答题
单项选择题 B1型题