2/1+2/1*3/1+3/1*4/1+4/1*5/1+5/1*6/1+6/1*7/1+7/1*8/1+8/1*9/1+9/1*10/1的答案是多少?
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![2/1+2/1*3/1+3/1*4/1+4/1*5/1+5/1*6/1+6/1*7/1+7/1*8/1+8/1*9/1+9/1*10/1的答案是多少?](/uploads/image/z/1860517-37-7.jpg?t=2%2F1%2B2%2F1%2A3%2F1%2B3%2F1%2A4%2F1%2B4%2F1%2A5%2F1%2B5%2F1%2A6%2F1%2B6%2F1%2A7%2F1%2B7%2F1%2A8%2F1%2B8%2F1%2A9%2F1%2B9%2F1%2A10%2F1%E7%9A%84%E7%AD%94%E6%A1%88%E6%98%AF%E5%A4%9A%E5%B0%91%3F)
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2/1+2/1*3/1+3/1*4/1+4/1*5/1+5/1*6/1+6/1*7/1+7/1*8/1+8/1*9/1+9/1*10/1的答案是多少?
2/1+2/1*3/1+3/1*4/1+4/1*5/1+5/1*6/1+6/1*7/1+7/1*8/1+8/1*9/1+9/1*10/1的答案是多少?
2/1+2/1*3/1+3/1*4/1+4/1*5/1+5/1*6/1+6/1*7/1+7/1*8/1+8/1*9/1+9/1*10/1的答案是多少?
你的分子分母写反了
1/2=1-1/2
1/2*1/3=1/2-1/3
1/3*1/4=1/3-1/4
.
所以原式=1-1/2+1/2-1/3+1/3-1/4+...+1/9-1/10
=1-1/10=9/10