Помогите сократить дробь 1)xyz/xz-yz 2)ax-ay/ax+ay 3)3cd+3d/6cd-3d
1) = xyz / z(x-y) = xy / x-y 2) = a(x-y) / a(x+y) = x-y / x+y 3) = 3d(c+1) / 3d(2c-1) = c+1 / 2c-1