Question

Помогите пж 1)задание решить

Answer 1

15a^3 b/21a^2 b^3 = 5a/7ab^2

(ax-x)/x^2= (x(a-1))/x^2= (a-1)/x

(4x^2-y^2)/(2x-y)=((2x-y)(2x+y))/(2x-y)=2x-y