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一、口算。
3.25÷0.01=
4.56+5.4=
15.7÷3.14=
7.3-1.9=
0.32×500=
$3.14×6^2=$
4.32÷0.2=
3×3.15=
219.8÷3.14=
0.22+0.84=
0.8÷1.6=
$3.14×8^2=$
7.6×0.1=
11.4-3.9=
314÷3.14=
28×0.4=
4.02+1.08=
3.14×0.9=
8-3.28=
1.5×0.3=
$3.14×30^2=$
0.4÷0.5=
6.4÷0.32=
251.2÷3.14=
3.25÷0.01=
4.56+5.4=
15.7÷3.14=
7.3-1.9=
0.32×500=
$3.14×6^2=$
4.32÷0.2=
3×3.15=
219.8÷3.14=
0.22+0.84=
0.8÷1.6=
$3.14×8^2=$
7.6×0.1=
11.4-3.9=
314÷3.14=
28×0.4=
4.02+1.08=
3.14×0.9=
8-3.28=
1.5×0.3=
$3.14×30^2=$
0.4÷0.5=
6.4÷0.32=
251.2÷3.14=
答案
325
9.96
5
5.4
160
113.04
21.6
9.45
70
1.06
0.5
200.96
0.76
7.5
100
11.2
5.1
2.826
4.72
0.45
2826
0.8
20
80
9.96
5
5.4
160
113.04
21.6
9.45
70
1.06
0.5
200.96
0.76
7.5
100
11.2
5.1
2.826
4.72
0.45
2826
0.8
20
80
二、计算下面各图形的周长和面积。
1.
2.
1.
2.
答案
1. 周长: $3.14 × 50 + 90 × 2 = 337(\mathrm{m})$
面积: $3.14 × (50 ÷ 2)^2 + 90 × 50 = 6462.5(\mathrm{m}^2)$
2. 周长: $3.14 × 8 + 20 × 2 = 65.12(\mathrm{cm})$
面积: $20 × 8 - 3.14 × (8 ÷ 2)^2 = 109.76(\mathrm{cm}^2)$
面积: $3.14 × (50 ÷ 2)^2 + 90 × 50 = 6462.5(\mathrm{m}^2)$
2. 周长: $3.14 × 8 + 20 × 2 = 65.12(\mathrm{cm})$
面积: $20 × 8 - 3.14 × (8 ÷ 2)^2 = 109.76(\mathrm{cm}^2)$
