1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)+.1/(x-2008)(x-2009)求解
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1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)+.1/(x-2008)(x-2009)求解1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)+.
1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)+.1/(x-2008)(x-2009)求解
1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)+.1/(x-2008)(x-2009)求解
1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)+.1/(x-2008)(x-2009)求解
=-[1/(x-1)-1/(x-2)+1/(x-2)-1/(x-3)+1/(x-3)-……-1/(x-2008)+1/(x-2008)-1/(x-2009)]
=-[1/(x-1)-1/(x-2009)]
=-[(x-2009)-(x-1)]/(x-1)(x-2009)
=2008/(x-1)(x-2009)
看其中的一个1/(x-1)(x-2)
=-[(x-2)-(x-1)]/(x-1)(x-2)=-[(x-2)/(x-1)(x-2)-(x-1)/(x-1)(x-2)]=-[1/(x-1)-1/(x-2)]
其它一样
解九宫格题目(X为未知数)9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1
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