问题 解答题

你能用简便方法计算吗?

4.8×25

1.25×3.2

101×8.8

15.6×8.6+4.4×8.6

4×1.25×2.5×0.8.

答案

(1)4.8×25

=1.2×(4×25)

=1.2×100

=120;

(2)1.25×3.2

=1.25×8×0.4

=10×0.4

=4

(3)101×8.8

=(100+1)×8.8

=100×8.8+8.8

=880+8.8

=888.8;

(4)15.6×8.6+4.4×8.6

=(15.6+4.4)×8.6

=20×8.6

=172

(5)4×1.25×2.5×0.8

=4×2.5×(1.25×0.8)

=10×1

=10.

单项选择题
单项选择题