Question

1) 8х^2+9у^2+2ху-х)*(-5у)
2) -10m (2m+4p)
3) (-b+y)*(-13-y)
Помогите плиз

Answer 1

1) непонятно написано.
2) -20m^2 - 40mp = m^2+2mp.
3) 13b + by - 13y - y^2.