3x³-4x²+5x+1,x³+2x-3x+4,
4x³-3x²+4x-5
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Answer:
3x³-4x²+5x+1+x³+2x²-3x+4+4x³-3x²+4x-5
=8x³-5x²+2x²+9x-3x+5-5
=8x³-3x²+6x
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