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一、口算。
$0.6^2 =$ $0.72×0.2 =$ $3.14×1^2 =$
$50^2 =$ $3.6÷0.06 =$ $3.14×2^2 =$
$0.8^2 =$ $0.12×0.5 =$ $3.14×3^2 =$
$20^2 =$ $2.58÷0.3 =$ $3.14×0.1^2 =$
$11^2 =$ $0.65+2.35 =$ $3.14×0.2^2 =$
$40^2 =$ $0.99÷11 =$ $3.14×0.3^2 =$
$0.3^2 =$ $0.96-0.7 =$ $3.14×10^2 =$
$60^2 =$ $4.8÷12 =$ $3.14×20^2 =$
$0.9^2 =$ $0.875÷0.125 =$ $3.14×30^2 =$
$14^2 =$ $0.45×20 =$ $3.14×100^2 =$
$0.6^2 =$ $0.72×0.2 =$ $3.14×1^2 =$
$50^2 =$ $3.6÷0.06 =$ $3.14×2^2 =$
$0.8^2 =$ $0.12×0.5 =$ $3.14×3^2 =$
$20^2 =$ $2.58÷0.3 =$ $3.14×0.1^2 =$
$11^2 =$ $0.65+2.35 =$ $3.14×0.2^2 =$
$40^2 =$ $0.99÷11 =$ $3.14×0.3^2 =$
$0.3^2 =$ $0.96-0.7 =$ $3.14×10^2 =$
$60^2 =$ $4.8÷12 =$ $3.14×20^2 =$
$0.9^2 =$ $0.875÷0.125 =$ $3.14×30^2 =$
$14^2 =$ $0.45×20 =$ $3.14×100^2 =$
答案
0.36
0.144
3.14
2500
60
12.56
0.64
0.06
28.26
400
8.6
0.0314
121
3
0.1256
1600
0.09
0.2826
0.09
0.26
314
3600
0.4
1256
0.81
7
2826
196
9
31400
0.144
3.14
2500
60
12.56
0.64
0.06
28.26
400
8.6
0.0314
121
3
0.1256
1600
0.09
0.2826
0.09
0.26
314
3600
0.4
1256
0.81
7
2826
196
9
31400
二、计算下面各图形的面积。
1.
2.
1.
2.
答案
1. $3.14×3^2=28.26(\mathrm{dm}^2)$
2. $3.14×(18÷2)^2=254.34(\mathrm{cm}^2)$
2. $3.14×(18÷2)^2=254.34(\mathrm{cm}^2)$
