阅读1/1*2=1-1/2,1/2*3=1/2-1/3,1/3*4=1/3-1/4...诺/a-1/+/ab-2=0试求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2).1/a+(2005)(b-2005)的值

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