若多项式3x³-2x²+3x+1与多项式x²-2mx³+2x+3的和为二次三项式,则m=
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若多项式3x³-2x²+3x+1与多项式x²-2mx³+2x+3的和为二次三项式,则m=
若多项式3x³-2x²+3x+1与多项式x²-2mx³+2x+3的和为二次三项式,则m=
若多项式3x³-2x²+3x+1与多项式x²-2mx³+2x+3的和为二次三项式,则m=
明显是m=3/2么,二次三项式故名最高次数为二次,因此两个多项式之和必定消掉三次.