Question

简便计算

（1）24.7×3.3＋3.3×75.3
（2）15÷2.5＋15÷7.5
（3）1.25×0.32×0.25
（4）17.2-(7.2+8)

Answer 1

（1）拍森24.7×3.3＋3.3×75.3
=3.3×(24.7+75.3)
=3.3×100
=330
（衫碧2）15÷2.5＋袭塌亩15÷7.5
=15÷2.5＋15÷3÷2.5
=15÷2.5＋5÷2.5
=(15+5)÷2.5
=20÷2.5
=8
（3）1.25×0.32×0.25
=1.25×0.8×0.25×0.4
=1×0.1
=0.1
（4）17.2-(7.2+8)
=17.2-7.2-8
=10-8
=2

Answer 2

1.330
2.1.5
3.0.1
4.2

Answer 3

3.3×(24.7+75.3)=3.3×100=330
15÷2.5＋15÷3÷2.5=15÷2.5＋5÷2.5=(15+5)÷2.5=20÷2.5==1.25×0.8×0.25×0.4=1×0.1=0.1
17.2-7.2-8=10-8=2

Answer 4

（1）运橡腔24.7×3.3＋3.3×75.3
=（24.7+75.3）×3.3
=100×3.3
=330
（2）15÷2.5＋15÷7.5
=15÷（5×0.5）+15÷（旁衫5×1.5）
=15÷5÷0.5+15÷5÷1.5
=6+2
=8
（3）如顷1.25×0.32×0.25
=1.25×0.4×0.8×0.25
=（1.25×0.8）×（0.4×0.25）
=1×0.1
=0.1
（4）17.2-(7.2+8)
=17.2-7.2-8
=10-8
=2

Answer 5

3.3*（24.7+75.3）