整式的加减应用题,若多项式2x³-8x²+x-1与多项式3x³+2mx²-5x+3相加后不含二次项,则m的值为多少?
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![整式的加减应用题,若多项式2x³-8x²+x-1与多项式3x³+2mx²-5x+3相加后不含二次项,则m的值为多少?](/uploads/image/z/607431-39-1.jpg?t=%E6%95%B4%E5%BC%8F%E7%9A%84%E5%8A%A0%E5%87%8F%E5%BA%94%E7%94%A8%E9%A2%98%2C%E8%8B%A5%E5%A4%9A%E9%A1%B9%E5%BC%8F2x%26%23179%3B-8x%26%23178%3B%2Bx-1%E4%B8%8E%E5%A4%9A%E9%A1%B9%E5%BC%8F3x%26%23179%3B%2B2mx%26%23178%3B-5x%2B3%E7%9B%B8%E5%8A%A0%E5%90%8E%E4%B8%8D%E5%90%AB%E4%BA%8C%E6%AC%A1%E9%A1%B9%2C%E5%88%99m%E7%9A%84%E5%80%BC%E4%B8%BA%E5%A4%9A%E5%B0%91%3F)
整式的加减应用题,若多项式2x³-8x²+x-1与多项式3x³+2mx²-5x+3相加后不含二次项,则m的值为多少?
整式的加减应用题,
若多项式2x³-8x²+x-1与多项式3x³+2mx²-5x+3相加后不含二次项,则m的值为多少?
整式的加减应用题,若多项式2x³-8x²+x-1与多项式3x³+2mx²-5x+3相加后不含二次项,则m的值为多少?
2x³-8x²+x-1 + 3x³+2mx²-5x+3 不含二次项,则说明:
二次项系数相等-8=2m
m=-4
2m=-8
所以m=-4