1.
а) (с+2)(с-3) = с²-с-6
б) (2а-1)(3a+4) = 6a²+5a-4
в) (5x-2y)(4x-y) = 20x²-13xy+2y²
г) (a-2)(a²-3a+6) = a³-5a²+12a-12
2.
а) a(a+3)-2(a+3) = (a+3)(a-2)
б) ax-ay+5x-5y = a(x-y)+5(x-y) = (x-y)(a+5)
3.
-0,1x(2x²+6)(5-4x²) = -0,1x(-8x⁴-14x²+30) = 0,8x⁵ + 1,4x³ - 3x