计算(2x³一3x²y一2xy²)一(x³一2xy²十y³)十(一x³十3x²y一y³)的值,其中x=½y=一1,甲同学把x=1/2错抄成x=一1/2,但计算结也是正确的,试说明理由,并求出这个结果.
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/17 03:20:54
![计算(2x³一3x²y一2xy²)一(x³一2xy²十y³)十(一x³十3x²y一y³)的值,其中x=½y=一1,甲同学把x=1/2错抄成x=一1/2,但计算结也是正确的,试说明理由,并求出这个结果.](/uploads/image/z/1730833-25-3.jpg?t=%E8%AE%A1%E7%AE%97%282x%26%23179%3B%E4%B8%803x%26%23178%3By%E4%B8%802xy%26%23178%3B%29%E4%B8%80%28x%26%23179%3B%E4%B8%802xy%26%23178%3B%E5%8D%81y%26%23179%3B%29%E5%8D%81%28%E4%B8%80x%26%23179%3B%E5%8D%813x%26%23178%3By%E4%B8%80y%26%23179%3B%29%E7%9A%84%E5%80%BC%2C%E5%85%B6%E4%B8%ADx%3D%26%23189%3By%3D%E4%B8%801%2C%E7%94%B2%E5%90%8C%E5%AD%A6%E6%8A%8Ax%3D1%2F2%E9%94%99%E6%8A%84%E6%88%90x%3D%E4%B8%801%2F2%2C%E4%BD%86%E8%AE%A1%E7%AE%97%E7%BB%93%E4%B9%9F%E6%98%AF%E6%AD%A3%E7%A1%AE%E7%9A%84%2C%E8%AF%95%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1%2C%E5%B9%B6%E6%B1%82%E5%87%BA%E8%BF%99%E4%B8%AA%E7%BB%93%E6%9E%9C.)
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