2x+6+x^2+3x=x(2+x)+3(2+x)=(2+x)(x+3)
А) y^2 + 4y - 2y - 8 = y^2 + 2y - 8
б) 6x^2 + 27x + 10 x - 45 = 6x^2 + 17x - 45
в) m^3 - m^2 + 3m + m^2 - m + 3 = m^3 + 2m + 3
9х^2-12x-6x+8=6x^2-2x+9x-3+3x^2-12x+x-4
9x^2-18x+8=9x^2-5x-7
-18x+5x=-8-7
-13x=-15
x=15/13
2/(x-4)-(x+8)/(x²-16)-1/x=2/(x-4)-(x+8)/((x-4)(x+4))-1/x=
(2*(x+4)*x)-(x+8)*x-x²+16)/((x*(x-4)(x+4))=(2x²+8x-x²-8x-x²+16)=16/(x³-16x).