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问题: 简便计算

1/1*2+1/2*3+1/3*4+1/4*5......+1/99*100=?

解答:

1/1*2+1/2*3+1/3*4+1/4*5......+1/99*100
=1-1/2+1/2-1/3+1/3-1/4......+1/99-1/100
=1-1/100
=99/100