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2-° (4X³- 4X + 2X²) + (7-8X²-X³)= 3X³ - 6X²- 4x+7
3-° ( X²-3X)+(4X²-3X+5)= 6X² - 6x+5
4-° (4X²-3X+5)- (10X²-4)= -6X - 3x+1
5-° (X²-3X) - (4X³-4X + 2X²)=-16x -X²-3x
6-° (7-8X²- X³) - (10X² - 4)= -x³- 79x²+11