Bài 3: Làm phép tính:
a, (x-x²+x²+3x): (x²-2x+3).
a, (2x²+5x³-2x+3):(2x2-x-1).
a, (2x²-9x²+19x-15): (x²-3x+5).
a, (2x+x³-3x²+5x-2):(x2-x+1).
a, (2x²-5x²+2x+2x-1): (x²-x-1).
a, (x²+4x²+3x²-5x+15): (x²-x+3).
a, (12x²-14x+3-6x+x+): (1-4x+x²).
a, (3x4-8x³-10x²+8x-5): (3x²-2x+1).
a, (2x4-13 ...
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