1.3³x3x9-3x3⁴x6; 2.-t(-t)²-t³ ; 3.b·b^n-1+b^2n+3·b³-b^n
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1.3³x3x9-3x3⁴x6; 2.-t(-t)²-t³ ; 3.b·b^n-1+b^2n+3·b³-b^n
1.3³x3x9-3x3⁴x6; 2.-t(-t)²-t³ ; 3.b·b^n-1+b^2n+3·b³-b^n
1.3³x3x9-3x3⁴x6; 2.-t(-t)²-t³ ; 3.b·b^n-1+b^2n+3·b³-b^n
(1)3^6-3^6*2=3^6*(1-2)=-3^6
(2)-t^3-t^3=-2t^3
(3)b^n-b^2n+3b^3-b^n=3b^3-b^2n