Question

Упростите выражение: (4y/2-y - y) : y+2/y-2 (ab/a^2 - b^2 - b/b-a) : (a-b + 4b^2 - a^2/ a+b)

Answer 1

1) (4y -y(2-y)/(2-y) * (y-2)/(y+2) =(4y-2y+y²)*(y-2) / (2-y)*(y+2) =(2y +y²)(y -2) / -(y -2)(y +2) = -y(2 +y) /(y +2) = -y