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?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 01:14:53
![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?](/uploads/image/z/1024421-5-1.jpg?t=%E8%8B%A5%E6%95%B4%E5%BC%8F2x%26%23179%3B-8x%26%23178%3B%2Bx-1%E4%B8%8E%E6%95%B4%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%ABx%E7%9A%84%E4%BA%8C%E6%AC%A1%E9%A1%B9%2C%E5%88%99m%E7%9A%84%E5%80%BC%E4%B8%BA%3F)
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