已知(a-1)²+|b+4|=0,求1/ab+1/(a+3)(b+3)+1/(a+6)(b+6)+1/(a+9)(b+9)的值已知(a-1)²+Ib+4I=0,求1/ab+1/(a+3)(b+3)+1/(a+6)(b+6)+1/(a+9)(b+9)的值

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