Question

Помоги пожалуйста упростить

Answer 1

a
1)4a/[(a-1)(a+1)]+(a-1)/(a+1)=(4a+a²-2a+1)/[(a-1)(a+1)]=
=(a²+2a+1)/[(a-1)(a+1)]=(a+1)²/[(a+1)(a-1)]=(a+1)/(a-1)
2)(a+1)/(a-1)*a/(a+1)=a/(a-1)
3)a/(a-1)-a(a-1)=0
b
1)a+6 + 6/(a-6)=(a²-36+6)/(a-6)=(a²-30)/(a-6)
2)(a²-30)/(a-6)*(a-6)²/(a²-30)=a-6