【(axa-1/a-1)+1】/(a+1)x(axa-1/axa+2a)

问题描述:

【(axa-1/a-1)+1】/(a+1)x(axa-1/axa+2a)

原式=[(a+1)(a-1)/(a-1)+1]/(a+1)×(a+1)(a-1)/a(a+2)
=[(a+1)+1]/(a+1)×(a+1)(a-1)/a(a+2)
=(a+2)/(a+1)×(a+1)(a-1)/a(a+2)
=(a-1)/a