Как решить???пожалуйста

1) a) a(b+a)/a²=(b+a)/a b) (x-3y)/(x-3y)(x+3y)= =1/(x+3y) 2) 1. (b(a+b)+a(a-b))/b(a-b)= =(ab+b²+a²-ab)/(b(a-b)= =(a²+b²)/(b(a-b) 2. (3x²-3x)/(x-1)=(3x(x-1))/(x-1) =3x 3. (5(a+b))*b)/(b²*(a+b)= =5/b 4. (y/(x(y-1))*(y-1)/4= =(y(y-1))/4x(y-1)=y/4x