Пожалуйста.
Сократите дробь

a)(3а+3b^2/(a+b)=(3(a+b))^2/(a+b)=9(a+b)^2/(a+b)=9(a+b)
b)(2c-6d)^2/(c-3d)=(2(c-3d))^2/(c-3d)=4(c-3d)
c)(3x-6y)^2/(5x-10y)=(3(x-2y))^2/(5(x-2y))=9(x-2y)/5
d)(9x^2-y^2)/(15x-5y)^2=(3x-y)(3x+y)/(5(3x-y))^2=(3x+y)/25(3x-y)