<span>1) <span>3^3*y^3-3*x^4*y^2+9*x^2*y=3y*(9y^2-x^4y+3x^2)</span></span>
<span>2) <span>2x-x^2+y^2+2y=(y-x+2)*(y+x)</span></span>
1) x³+x²y-4y-4x = x²(x+y)-4(y+x) = (x+y)(x²-4) = (x+y)(x-2)(x+2)
2)x³-3y²+3x²-xy² = x²(x+3)-y²(3+x) = (x+3)(x²-y²) = (x+3)(x+y)(x-y)
(у+3)•(у^2+9у+20)
слогаемое (у+3) выносите за скобки