1)a/b+b/a+2=(a²+b²+2ab)/ab=(a+b)²/ab
2)(a_b)/2a-b/(a+b)=(a²+2ab+b²-2ab)/[2a(a+b)]=(a²+b²)/[2a(a+b)]
3)(a+b)²/ab *(a²+b²)/[2a(a+b)]=(a+b)(a²+b²)/2a²b
4)a+2b +b²/a=(a²+2ab+b²)/a=(a+b)²/a
5)a/(a+b)+b/(a-b)=(a²-ab+ab+b²)/(a²-b²)=(a²+b²)/(a²-b²)
6)(a+b)²/a*(a²+b²)/[(a-b)(a+b)]=(a+b)(a²+b²)/[a(a-b)]
7)(a+b)(a²+b²)/2a²b :(a+b)(a²+b²)/[a(a-b)]=
=(a+b)(a²+b²)/2a²b *a(a-b)/[(a+b)(a²+b²)]=(a-b)/2ab
a=3/4,b=4/3
(3/4-4/3);(2*3/4*4/3)=(9-16)/12:2=-7/24