做一对圆柱形的无盖水桶。如果他的底面半径是4分米，高是6分米，至少需要多少铁皮？7k/J4Y(z5t/P8v4f*a4s2T
解：
算式：提示8Y'q*j4C5K*a;F.j7b7U1W7k/J4Y(z5t/P8v4f*a4s2T
答：至少需要铁皮面积为-d0E0c平方分米。7k/J4Y(z5t/P8v4f*a4s2T