x(x-1)分之1+(x—1)(x-2)分之1+(x-2)(x-3)分之1+(x-3)(x-4)分之1 (x=104)
题目
x(x-1)分之1+(x—1)(x-2)分之1+(x-2)(x-3)分之1+(x-3)(x-4)分之1 (x=104)
答案
1/(x-1)+1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)=[(x-2)+1]/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)=1/(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)=[(x-3)+1]/(x-2)(x-3)+1/(x-3)(x-4)=1/(x-3)+1/(x-3)(x-4)=1/(x-4)=1/(x-4)带...
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