简便运算，在线等，小学五年级

Question

1：2.31*1.2*0.5
2：4.9/14
3：7.3*10.2-1.46
4：0.92*1.01
5：12.96-（9.6-1.52）
6：1.2/0.25+1.3*4
7：（4.8+6.4）/8

Answer 1

2.31*1.2*0.5=2.31*0.6=1.386
4.9/14=0.7*7/14=3.5
7.3*10.2-1.46=7.3(10+0.2)-1.46=73+1.46-1.46=73
0.92*1.01=0.92*(1+0.01)=0.9292
12.96-（9.6-1.52）=13-0.04-10+0.4+1.52=4.88
1.2/0.25+1.3*4=1.2*4+1.3*4=(1.2+1.3)*4=10
(4.8+6.4）/8=4.8/8+6.4/8=0.6+0.8=1.4

Answer 2

1：2.31*1.2*0.5
=2.31*（1.2*0.5)
=2.31*0.6
=1.386

2：4.9/14
=(7*0.7)/(7*2)
=0.7/2
=0.35

3：7.3*10.2-1.46
=7.3*(10+0.2)-1.46
=73+1.46-1.46
=73

4：0.92*1.01
=0.92*(1+0.01)
=0.92+0.0092
=0.9292

5：12.96-（9.6-1.52）
=(13-0.04)-(9.6-1.52)
=(13-9.6)+(1.52-0.04)
=3.4+1.48
=4.88

6：1.2/0.25+1.3*4
=1.2*4+1.3*4
=(1.2+1.3)*4
=2.5*4
=10

7：（4.8+6.4）/8
=(0.6*8+0.8*8)/8
=0.6+0.8
=1.4

Answer 3

1:1.386
2:0.35
3:73
4:0.9292
5:4.88
6:10
7:1.4