<span>c^3 - 16c=c(c</span>²-16)=c(c-4)(c+4)<span>
3a^2 - 6ab + 3b^2=3(a</span>²<span>-2ab+b</span>²)=3(a-b)(a-b)<span>
y^2 - x^2 - 6x - 9=y</span>²-(x+3)²=(y+x+3)(y-x-3)<span>
81a^4 - 1=(9a</span>²-1)(9a²+1)=(3a-1)(3a+1)(9a²+1)
A{-2;-7;-5}
b{-5;4;6}
a*b={(-2*-5);(-7*4);(-5*6)}
a*b{10;-28;-30}
= - 10х⁵у⁷
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