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一、口算。
0.77 + 0.33 =
3.5 × 0.2 =
1.256 ÷ 3.14 =
6.4 ÷ 0.8 =
1.68 + 1.5 =
94.2 ÷ 3.14 =
0.9 - 0.26 =
0.36 ÷ 0.12 =
3.14 × 500 =
4.8 × 8 =
2.6 ÷ 0.5 =
3.14 × 0.02 =
$0.4^2 - 0.3^2 =$
0.6 ÷ 0.15 =
15.7 ÷ 3.14 =
2.5 × 0.8 =
3.6 ÷ 1.2 =
6.28 ÷ 3.14 =
0.48 ÷ 0.03 =
0.105 × 100 =
3.14 × 70 =
0.08 × 0.9 =
0.4 × 0.15 =
75.36 ÷ 3.14 =
0.77 + 0.33 =
3.5 × 0.2 =
1.256 ÷ 3.14 =
6.4 ÷ 0.8 =
1.68 + 1.5 =
94.2 ÷ 3.14 =
0.9 - 0.26 =
0.36 ÷ 0.12 =
3.14 × 500 =
4.8 × 8 =
2.6 ÷ 0.5 =
3.14 × 0.02 =
$0.4^2 - 0.3^2 =$
0.6 ÷ 0.15 =
15.7 ÷ 3.14 =
2.5 × 0.8 =
3.6 ÷ 1.2 =
6.28 ÷ 3.14 =
0.48 ÷ 0.03 =
0.105 × 100 =
3.14 × 70 =
0.08 × 0.9 =
0.4 × 0.15 =
75.36 ÷ 3.14 =
答案
1.1
0.7
0.4
8
3.18
30
0.64
3
1570
38.4
5.2
0.0628
0.07
4
5
2
3
2
16
10.5
219.8
0.072
0.06
24
0.7
0.4
8
3.18
30
0.64
3
1570
38.4
5.2
0.0628
0.07
4
5
2
3
2
16
10.5
219.8
0.072
0.06
24
二、计算下面各图形中涂色部分的面积。（单位：cm）
1.
2.
1.
2.
答案
1. $10×8−3.14×(8÷2)^2=29.76(\mathrm{cm}^2)$
2. $3.14×(10÷2)^2÷2−10×(10÷2)÷2=14.25(\mathrm{cm}^2)$
2. $3.14×(10÷2)^2÷2−10×(10÷2)÷2=14.25(\mathrm{cm}^2)$
