Question

计算下面各题，能简算的要简算．12.25+42+7.75 &...

计算下面各题，能简算的要简算．12.25+42+7.75 10.1×785.6-0.71-0.294.8÷0.24÷2 23.7×0.25×8 19.4×0.9+0.1×19.42.3+9×（22-18.7）0.7×[13-（3.22+5.38）]

Answer 1

（1）12.25+42+7.75
=（12.25+7.75）+42
=20+42
=62

（2）10.1×78
=（10+0.1）×78
=10×78+0.1×78
=780+7.8
=787.8

（3）5.6-0.71-0.29
=5.6-（0.71+0.29）
=5.6-1
=4.6

（4）4.8÷0.24÷2
=4.8÷2÷0.24
=2.4÷0.24
=10

（5）23.7×0.25×8 
=23.7×（0.25×8）
=23.7×2
=47.4

（6）19.4×0.9+0.1×19.4
=19.4×（0.9+0.1）
=19.4×1
=19.4

（7）2.3+9×（22-18.7）
=2.3+9×3.3
=2.3+29.7
=32

（8）0.7×[13-（3.22+5.38）]
=0.7×[13-8.6]
=0.7×4.4
=3.08