Помогите упрашиваю!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

1) (d-5)(9d+1)(3d-9) = (9d+d-45d-5)(3d-9) = (9d-44d-5)(3d-9) = 27d-81d-132d+396d-15d+45 = 27d-213d+381d+45

2) (b+4b+2)(-b-4b+2) = (2+b+4b)(2-b-4b) = 4-(b+4b) = 4-(b+8b+16b) = 4-b-8b-16b = -b-8b-16b+4

3) (x+y)(x-3xy+2xy+y) = x-3xy+2xy+xy+xy-3xy+2x+y = x-3xy-xy+xy+xy+2xy+y