一座电视塔的圆形塔底的半径是30米,现在要在他的周围种上20米宽的环形草坪(如图)0@-^*I8w2E)A(?/\(`:M2^)d
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(1)草坪的面积有多大?0@-^*I8w2E)A(?/\(`:M2^)d
(2)如果每平方米草坪需要90元,种植这块草坪需要多少元?0@-^*I8w2E)A(?/\(`:M2^)d
(3)如果在草坪的四周围一圈铁栏杆,这圈铁栏杆长多少米?0@-^*I8w2E)A(?/\(`:M2^)d
算式:提示,]'r:l:{5p)u*F)k)S6]0@-^*I8w2E)A(?/\(`:M2^)d
答:草坪的面积有5024平方米,种植这块草坪需要452160元,铁栏杆长1U7A2m0U7`2F0O米。0@-^*I8w2E)A(?/\(`:M2^)d