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(x.x²+x.2x+x.1)+(1.x²+1.2x+1.1)
(x^3+2x²+x)+(x²+2x+1)
x^3+3x²+3x+1
2. (x-5)(2x²-x+1)
(x.2x²-x.x+x.1)-(5.2x²-5.x+-5.1)
(2x^3-x²+x)-(10x²-5x-5)
2x^3-11x²+6x+5