计算1-(a-1)/a÷[a/(a+2)-1/(a2+2a)]等于?

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计算1-(a-1)/a÷[a/(a+2)-1/(a2+2a)]等于?计算1-(a-1)/a÷[a/(a+2)-1/(a2+2a)]等于?计算1-(a-1)/a÷[a/(a+2)-1/(a2+2a)]等

计算1-(a-1)/a÷[a/(a+2)-1/(a2+2a)]等于?
计算1-(a-1)/a÷[a/(a+2)-1/(a2+2a)]等于?

计算1-(a-1)/a÷[a/(a+2)-1/(a2+2a)]等于?
1-(a-1)/a÷[a/(a+2)-1/(a²+2a)]?
=1-(a-1)/a÷{[(a²-1)/[a(a+2)]}
=1-(a-1)/a÷{(a-1)(a+1)/[a(a+2)]}
=1-(a-1)/a×{[a(a+2)]/[(a-1)(a+1)]}
=1-(a+2)/(a+1)
=[a+1-(a+2)]/(a+1)
=-1/(a+1)