1加3又1/8+5又1/24+7又1/48+9又1 /80+.19又1/360等于多少谢谢了,
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![1加3又1/8+5又1/24+7又1/48+9又1 /80+.19又1/360等于多少谢谢了,](/uploads/image/z/58987-19-7.jpg?t=1%E5%8A%A03%E5%8F%881%2F8%2B5%E5%8F%881%2F24%2B7%E5%8F%881%2F48%2B9%E5%8F%881+%2F80%2B.19%E5%8F%881%2F360%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%E8%B0%A2%E8%B0%A2%E4%BA%86%2C)
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1加3又1/8+5又1/24+7又1/48+9又1 /80+.19又1/360等于多少谢谢了,
1加3又1/8+5又1/24+7又1/48+9又1 /80+.19又1/360等于多少谢谢了,
1加3又1/8+5又1/24+7又1/48+9又1 /80+.19又1/360等于多少谢谢了,
原式=(1+3+……+19)+(1/8+1/24+1/48+……+1/360) =10x(1+19)/2+1/4x[(1-1/2)+(1/2-1/3)+……+(1/9-1/10)] =100+1/4x(1-1/10) =100+9/40 =100又9/40