1/18+1/54+1/108+……+1/810+1/990等于多少?
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![1/18+1/54+1/108+……+1/810+1/990等于多少?](/uploads/image/z/640637-53-7.jpg?t=1%2F18%2B1%2F54%2B1%2F108%2B%E2%80%A6%E2%80%A6%2B1%2F810%2B1%2F990%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F)
1/18+1/54+1/108+……+1/810+1/990等于多少?
1/18+1/54+1/108+……+1/810+1/990等于多少?
1/18+1/54+1/108+……+1/810+1/990等于多少?
1/18+1/54+1/108+……+1/810+1/990
=(1/3-1/6+1/6-1/9+1/9-1/12+……+1/27-1/30+1/30-1/33)÷3
=(1/3-1/33)÷3
=10/33÷3
=10/99