1.直接写出得数。（每题2★）
3.5+2.8=
9.1-4.7=
16.5-2.7-7.3=
5.33-2.01=
3.07+2.8=
7.25-3.2-2.25=
7.5-1.25=
1.8+5.12=
0.9+2.72+0.1=
2.62+3.45=
9.6-2.34=
6.15+(3.85+8.3)=
$\frac{4}{100}+0.8=$
$\frac{9}{10}-\frac{54}{100}=$
4.69-(1.69+0.5)=

1. 3.5+2.8=6.3
9.1-4.7=4.4
16.5-2.7-7.3=6.5
5.33-2.01=3.32
3.07+2.8=5.87
7.25-3.2-2.25=1.8
7.5-1.25=6.25
1.8+5.12=6.92
0.9+2.72+0.1=3.72
2.62+3.45=6.07
9.6-2.34=7.26
6.15+(3.85+8.3)=18.3
$\frac{4}{100}+0.8=0.84$
$\frac{9}{10}-\frac{54}{100}=0.36$
4.69-(1.69+0.5)=2.5

2.计算下面各题,怎样简便就怎样算。(每题4★)
77.3+63.52+22.7
8.65+3.76+1.35+5.24
34.06-(3.06+8.7)
3.42+32.7-12.7+9.58
19.38-(9.4-0.62)
8.2-4.75+1.8-1.25

2. 77.3+63.52+22.7=163.52
8.65+3.76+1.35+5.24=19
34.06-(3.06+8.7)=22.3
3.42+32.7-12.7+9.58=33
19.38-(9.4-0.62)=10.6
8.2-4.75+1.8-1.25=4