а) 39x³y/26x²y²=3x/2y
б) 3y/(y²-2y)=3y/y(y-2)=3/(y-2)
в) (3a-3b)/(a²-b²)=3(a-b)/(a-b)(a+b)=
=3/(a+b)
г) (a²-25)/(a²-10a+25)=
=(a-5)(a+5)/(a-5)²=(a+5)/(a-5)
а) 39x³y/26x²y²=3x/2y
б) 3y/(y²-2y)=3y/y(y-2)=3/(y-2)
в) (3a-3b)/(a²-b²)=3(a-b)/(a-b)(a+b)=
=3/(a+b)
г) (a²-25)/(a²-10a+25)=
=(a-5)(a+5)/(a-5)²=(a+5)/(a-5)