问题 解答题

简便运算我也行.

2.06×101

0.25×125×0.32

1.25×8.8

31.8×2.5+31.8×7.5.

答案

(1)2.06×101

=2.06×(100+1)

=2.06×100+2.06×1

=206+2.06

=208.06;

(2)0.25×125×0.32

=0.25×125×0.4×0.8

=(0.25×0.4)×(125×0.8)

=0.1×100

=10;

(3)1.25×8.8

=1.25×(8+0.8)

=1.25×8+1.25×0.8

=10+1

=11;

(4)31.8×2.5+31.8×7.5

=31.8×(2.5+7.5)

=31.8×10

=318.

单项选择题 A2型题
单项选择题