7x²y-2xy²+2yx²+y²x-3xy²怎么做?是合并同类项在算出答案.今晚就要的还有一题是3x²y-5xy²=-2x²y.判断对错,如果是错的要说出错在哪里
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 06:43:55
![7x²y-2xy²+2yx²+y²x-3xy²怎么做?是合并同类项在算出答案.今晚就要的还有一题是3x²y-5xy²=-2x²y.判断对错,如果是错的要说出错在哪里](/uploads/image/z/2536575-15-5.jpg?t=7x%26%23178%3By-2xy%26%23178%3B%2B2yx%26%23178%3B%2By%26%23178%3Bx-3xy%26%23178%3B%E6%80%8E%E4%B9%88%E5%81%9A%3F%E6%98%AF%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9%E5%9C%A8%E7%AE%97%E5%87%BA%E7%AD%94%E6%A1%88.%E4%BB%8A%E6%99%9A%E5%B0%B1%E8%A6%81%E7%9A%84%E8%BF%98%E6%9C%89%E4%B8%80%E9%A2%98%E6%98%AF3x%26%23178%3By-5xy%26%23178%3B%3D-2x%26%23178%3By.%E5%88%A4%E6%96%AD%E5%AF%B9%E9%94%99%2C%E5%A6%82%E6%9E%9C%E6%98%AF%E9%94%99%E7%9A%84%E8%A6%81%E8%AF%B4%E5%87%BA%E9%94%99%E5%9C%A8%E5%93%AA%E9%87%8C)
7x²y-2xy²+2yx²+y²x-3xy²怎么做?是合并同类项在算出答案.今晚就要的还有一题是3x²y-5xy²=-2x²y.判断对错,如果是错的要说出错在哪里
7x²y-2xy²+2yx²+y²x-3xy²怎么做?是合并同类项在算出答案.
今晚就要的
还有一题是3x²y-5xy²=-2x²y.判断对错,如果是错的要说出错在哪里
7x²y-2xy²+2yx²+y²x-3xy²怎么做?是合并同类项在算出答案.今晚就要的还有一题是3x²y-5xy²=-2x²y.判断对错,如果是错的要说出错在哪里
原式=7x²y+2yx²-2xy²+y²x-3xy²
=9x²y-4xy²
3x²y-5xy²=-2x²y是错的,因为3x²y和-5xy²不是同类项,不能合并同类项