Сократите дробь а)x+2/4-x^2 б)a^2-ax/a^2-x^2 в)x^2-y^2/2ay+2ax г)x^2+2xy+y^2/2x^2-2y^2

a) x+2/(2-x)*(2+x) = 1/2-x; б)a*(a-x)/(a-x)*(a+x) = a/a+x; в)(x-y)*(x+y)/2a*(x+y) = x-y/2a г)(x+y)^2/2*(x-y)*(x+y) = x+y/2*(x-y)