已知多项式A=2x²-9x-11,B=3x²+5x+4,求-(A-2B)
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已知多项式A=2x²-9x-11,B=3x²+5x+4,求-(A-2B)
已知多项式A=2x²-9x-11,B=3x²+5x+4,求-(A-2B)
已知多项式A=2x²-9x-11,B=3x²+5x+4,求-(A-2B)
-(A-2B)
=2B-A
=2(3x²+5x+4)-(2x²-9x-11)
=6x²+10x+8-2x²+9x+11
=4x²+19x+19
4x²+19x+19
?