用简便方法计算
1.75+0.43+3025=1.75+（0.43+3.25）
=1.75+3.68=5.43
3.4+2.7+6.6=（3.4+2.7）+6.6
=5.11+6.6=12.7
8.04-0.67-1.33=8.04-（0.67-1.33）
=8.04-（-0.73）=6.04
23-5.61-4.39=23-（5.61-4.39）=23-1.22=13
3.84+5.29+4.71=3.84+（5.29+4.71）=3.84+10=13.84
6.7+3.08+6.92=（6.7+3.08）+6.92=9.78+6.92=16.7
15.62-0.35-5.62=（15.62-0.35）-5.62=15.27-5.62=9.65
40.7-3.27-1.73=40.7-（3.27-1.73）=40.7-1.54=35.7
9.37-（4.6+1.37）=9.37-5.97=3.4
11.62-（5.62+3.1）=11.62-8.72=2.9
6.91-（3.91+0.48）=6.91-4.39=2.52
9.83-（4.7+2.83）=9.83-7.53=2.3
11.9+5.36+4.64+8.1=（11.9+5.36）+（4.64+8.1）=17.26+12.74=30
13.4+0.57+1.43+1.6=（13.4+0.57）+（1.43+1.6）=13.97+3.03=17
18.4-0.7-1.2-1.1=（18.4-0.7）-（1.2-1.1）=17.7-0.1=15.4
15-7.8-1.15-1.05=（15-7.8）-（1.15-1.05）=7.2-0.1=5