数学简便计算(讲解)(1/1*2)+(1/2*3)+(1/3*4)......(1/2000*2001)=
3个回答
1/(n-1)*n = 1/(n-1) - 1/n
=>
原式= 1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 ...+ 1/2000 - 1/2001
= 2000/2001
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1/1x2+1/2x3+1/3x4+1/4x5...1/2001x2002 简便计算