1. 直接写出得数。
5.3 + 0.7 =
3.2 ÷ 16 =
9.5 ÷ 5 =
21 × 8 ÷ 2 =
2.4 ÷ 10 =
4.8 ÷ 4 =
5.4 × 5 =
20 ÷ 4 ÷ 50 =
0.24 ÷ 2 =
0.9 ÷ 30 =
2.8 × 30 =
20 × 28 ÷ 7 =
1.1 × 7 =
0.8 × 20 =
12 ÷ 40 =
(3 + 17) × 22 =
2.6 ÷ 13 =
1.82 ÷ 5 =
2.5 × 36 =
5 - 0.6 + 3 =
0.8 ÷ 16 =
2.6 × 30 =
7.7 + 0.3 =
300 × 4 ÷ 30 =
3.6 × 10 =
4.7 ÷ 100 =
2.8 ÷ 4 =
350 ÷ (7 × 5) =
1.7 × 4 =
2.44 ÷ 4 =
3.9 ÷ 13 =
720 - 149 - 51 =

1. 6 0.2 1.9 84
0.24 1.2 27 0.1
0.12 0.03 84 80
7.7 16 0.3 440
0.2 0.364 90 7.4
0.05 78 8 40
36 0.047 0.7 10
6.8 0.61 0.3 520

2. 计算下面各题，能简算的要简算。
122×11
134 + 189 + 366 + 20
93×101−93
125×88
84×25 + 16×25
609÷[60×(50−15)]

2. 1342 709 9300
11000 2500 0.29

如图，正方形的边长是10厘米，涂色部分的面积是多少平方厘米？

10×10÷2=50(平方厘米)