×2 ÷2
÷1 1× 1-
圆的半径(r) |
圆的直径(d) |
圆的周长(C) |
圆的面积(S) |
3cm |
|
|
|
|
4cm |
|
|
|
|
3.14cm |
正方形的边长和面积.
÷3= ×26= 4÷ = 0.5× =
5× = ÷ = × = × =
2006-619= 8÷20= 7.06-0.06=
0.3×0.4=