1. Раціональні вирази - Вправи 1- 100 » 43

Скоротіть дріб: 1) ((3a+3b)^2)/(a+b) = ((3(a+b))^2)/(a+b) = (9(a+b)^2)/(a+b) = (9(a+b))/1 = 9a + 9b; 2) ((6x-18y)^2)/(x^2- 9y^2 ) = ((6(x-3y))^2)/((x-3y)(x+3y) ) = (36(x-3y)(x-3y))/(x-3y)(x+3y) = (36(x-3y))/(x+3y) = (36x-108y)/(x+3y); 3) (xy+x-5y-5)/(4y+4) = (x(y+1)- 5(y+1))/(4(y+1)) = ((y+1)(x-5))/(4(y+1)) = (x-5)/4; 4) (a^2- ab+2b-2a)/(a^2- 4a+4) = (a(a-b)- 2(a-b))/((a-2)^2 ) = ((a-b)(a-2))/((a-2)^2 ) = (a-b)/(a-2).