X²-XY-6Y²+2X-Y+1先配二次项=(x-3y)(x+2y)+2x-y+1需要x-3y 所以构造x-3y=(x-3y)(x+2y)+x-3y+x+2y+1=(x-3y)(x+2y+1)+x+2y+1=(x-3y+1)(x-2y+1)其中说的先配二次项为啥要配?二次项怎么配还有说的需要X-3Y所以构造x-3y
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/21 01:38:10
![X²-XY-6Y²+2X-Y+1先配二次项=(x-3y)(x+2y)+2x-y+1需要x-3y 所以构造x-3y=(x-3y)(x+2y)+x-3y+x+2y+1=(x-3y)(x+2y+1)+x+2y+1=(x-3y+1)(x-2y+1)其中说的先配二次项为啥要配?二次项怎么配还有说的需要X-3Y所以构造x-3y](/uploads/image/z/12188179-19-9.jpg?t=X%26sup2%3B-XY-6Y%26sup2%3B%2B2X-Y%2B1%E5%85%88%E9%85%8D%E4%BA%8C%E6%AC%A1%E9%A1%B9%3D%28x-3y%29%28x%2B2y%29%2B2x-y%2B1%E9%9C%80%E8%A6%81x-3y+%E6%89%80%E4%BB%A5%E6%9E%84%E9%80%A0x-3y%3D%28x-3y%29%28x%2B2y%29%2Bx-3y%2Bx%2B2y%2B1%3D%28x-3y%29%28x%2B2y%2B1%29%2Bx%2B2y%2B1%3D%28x-3y%2B1%29%28x-2y%2B1%29%E5%85%B6%E4%B8%AD%E8%AF%B4%E7%9A%84%E5%85%88%E9%85%8D%E4%BA%8C%E6%AC%A1%E9%A1%B9%E4%B8%BA%E5%95%A5%E8%A6%81%E9%85%8D%3F%E4%BA%8C%E6%AC%A1%E9%A1%B9%E6%80%8E%E4%B9%88%E9%85%8D%E8%BF%98%E6%9C%89%E8%AF%B4%E7%9A%84%E9%9C%80%E8%A6%81X-3Y%E6%89%80%E4%BB%A5%E6%9E%84%E9%80%A0x-3y)
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