若整式2x³-8x²+x-1与整式3x³+2mx²-5x+3相加后不含x的二次项,则m的值为?
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若整式2x³-8x²+x-1与整式3x³+2mx²-5x+3相加后不含x的二次项,则m的值为?
若整式2x³-8x²+x-1与整式3x³+2mx²-5x+3相加后不含x的二次项,则m的值为?
若整式2x³-8x²+x-1与整式3x³+2mx²-5x+3相加后不含x的二次项,则m的值为?
2x³-8x²+x-1+3x³+2mx²-5x+3
=5x³-(8-2m)x²-4x+2
因为不含x²
所以
8-2m=0
m=4