2016-06-02 12:06发布
一共要栽多少棵雪松
(20+2)x2=44m (直径)
44x3.14=138.16m (周长)
138.16÷3.14=44棵
(20+2)*(20+2)*3.14/3.14
=22*22
=484(棵)
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(20+2)x2=44m (直径)
44x3.14=138.16m (周长)
138.16÷3.14=44棵
(20+2)*(20+2)*3.14/3.14
=22*22
=484(棵)
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