Question

帮我算下面的题目，简便计算哦~拜托了。。

（1）12.5×0.25×0.8×40 （2）0.279×355+0.645×279

拜托了。

Answer 1

（1）12.5×0.25×0.8×40
= （12.5×0.8）×（0.25×40）
= 10 × 10
= 100

（2）0.279×355+0.645×279
= 0.279 ×355 + 0.279 ×645
= 0.279×（355 + 645）
= 0.279× 1000
= 279

希望帮到你

Answer 2

12.5×0.25×0.8×40
=12.5×0.8×0.25×40
=10×10
=100

0.279×355+0.645×279
=0.279×355+645×0.279
=0.279×（355+645）
=0.279×1000
=279

Answer 3

(12.5×0.8)×(0.25×40)=10×10=100
279×(0.355+0.645)=279×1=279

Answer 4

(1)200
(2)279