Question

Решите пожалуйста 449,452

Answer 1

а) (36y*y / xy - 25x*x / xy) / (6y-5x) = (36y^2/xy - 25x^2/xy) / 6y-5x = (36y^2-25x^2)/xy / 6y-5x = (6y-5y)(6y+5y)/xy / (6y-5x) = (6y+5y)/xy

b) (49b^2-36a^2)/ab *1/(7b+6a) = (7b-6a)(7b+6a)/ab / (7b+6a) = (7b-6a)/ab