Question

计算:1-a分之a-1除以a的平方+2a分之a的平方-1

Answer 1

1减a分之a-1 除以 a的平方+2a分之a的平方-1

=1-(a-1)/a÷(a²-1)/(a²+2a)

=1-(a-1)/a×[a(a+2)/(a-1)(a+1)]

=1-(a+2)/(a-1)

=(a-1-a-2)/(a-1)

=-3/(a-1

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