բ) (7x²-2x+4-x²)(2x-x-1)=(6x²-2x+4)(x-1)=6x³-2x²+4x-6x²+2x-4=6x³-8x²+6x-4

դ) (2m³-7m²+4m)(3-8m+m²)=6m³-21m²+12m-16m⁴+56m³-32m²+2m⁵-7m⁴+4m³=66m³-53m²+12m-23m⁴+2m⁵

զ) (x-3)(2x-1)(7+2x)=(x-3)(14x+4x²-7-2x)=(x-3)(12x+4x²-7)=12x²+4x³-7x-36x-12x²+21=4x³-43x+21

ը) (p-8q)(4q-p)(p+8q)=(p-8q)(4pq+32q²-p²-8pq)=(p-8q)(-4pq+32q²-p²)=-4p²q+32pq²-p³+32pq²-256q³+8p²q=4p²q+64pq²-p³-256q³