计算.化简4x²+2x+7+3x-8x²-26x²y+2xy-8x²y-4x-5

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/04/29 01:58:54

计算.化简
4x²+2x+7+3x-8x²-2
6x²y+2xy-8x²y-4x-5xy+2y²x²-6x²y

4x²+2x+7+3x-8x²-2=4x²-8x²+2x+3x+7-2=-4x²+5x+5
6x²y+2xy-8x²y-4x-5xy+2y²x²-6x²y=6x²y-8x²y-6x²y+2xy-5xy-4x+2y²x²=-8x²y-4x-3xy+2y²x²
再问：还有两个。。不好意思啦~ xy²-1/5xy² -3x²y+2x²y+3xy²-2xy²
再答： xy²-1/5xy²=4/5xy² -3x²y+2x²y+3xy²-2xy²=-x²y+xy²

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