1
1)b/a(a-b) -a/b(a-b)=(b²-a²)/ab(a-b)=(b-a)(b+a)/ab(a-b)=-(a+b)/ab
2)-(a+b)/ab*ab(a+b)/(a-b)(a+b)=-(a+b)/a-b)=(a+b)/(b-a)
2
1)2a/(a+2)-2a/3(a-2)+8a/(a-2)(a+2)=(6a²-12a-2a²-4a+24a)/3(a-2)(a+2)=
=(4a²+8a)/3(a-2)(a+2)=4a(a+2)/3(a-2)(a+2)=4a/3(a-2)
2)4a/3(a-2):(a-4)/(a-2)=4a/3(a-2)*(a-2)/(a-4)=4a/3(a-4)