X²-XY-2Y²=0怎么得到下一步(X-2Y)(X+Y)=0X²-XY-2Y²=0怎么得到下一步(X-2Y)(X+Y)=0,难道是固定公式吗?有人方便解释下吗
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/01 04:43:29
![X²-XY-2Y²=0怎么得到下一步(X-2Y)(X+Y)=0X²-XY-2Y²=0怎么得到下一步(X-2Y)(X+Y)=0,难道是固定公式吗?有人方便解释下吗](/uploads/image/z/3777228-36-8.jpg?t=%26%238203%3BX%26%23178%3B-XY-2Y%26%23178%3B%3D0%E6%80%8E%E4%B9%88%E5%BE%97%E5%88%B0%E4%B8%8B%E4%B8%80%E6%AD%A5%28X-2Y%29%28X%2BY%29%3D0X%26%23178%3B-XY-2Y%26%23178%3B%3D0%E6%80%8E%E4%B9%88%E5%BE%97%E5%88%B0%E4%B8%8B%E4%B8%80%E6%AD%A5%28X-2Y%29%28X%2BY%29%3D0%2C%E9%9A%BE%E9%81%93%E6%98%AF%E5%9B%BA%E5%AE%9A%E5%85%AC%E5%BC%8F%E5%90%97%3F%E6%9C%89%E4%BA%BA%E6%96%B9%E4%BE%BF%E8%A7%A3%E9%87%8A%E4%B8%8B%E5%90%97)
X²-XY-2Y²=0怎么得到下一步(X-2Y)(X+Y)=0X²-XY-2Y²=0怎么得到下一步(X-2Y)(X+Y)=0,难道是固定公式吗?有人方便解释下吗
X²-XY-2Y²=0怎么得到下一步(X-2Y)(X+Y)=0
X²-XY-2Y²=0怎么得到下一步(X-2Y)(X+Y)=0,难道是固定公式吗?有人方便解释下吗
X²-XY-2Y²=0怎么得到下一步(X-2Y)(X+Y)=0X²-XY-2Y²=0怎么得到下一步(X-2Y)(X+Y)=0,难道是固定公式吗?有人方便解释下吗
X²-XY-2Y²=0
X²-2XY+XY-2Y²=0
X(X-2Y)+Y(X-2Y)=0
(X-2Y)(X+Y)=0
或者用:
用十字相乘法分解因式得:
1 -2
╳
1 1
(X-2Y)(X+Y)=0