充要条件的证明问题已知ab不等于0,求证:a+b=1的充要条件是a*a*a+b*b*b+ab-a*a-b*b=0 (注*为乘号且要从必要性和充分性两方面证明)
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![充要条件的证明问题已知ab不等于0,求证:a+b=1的充要条件是a*a*a+b*b*b+ab-a*a-b*b=0 (注*为乘号且要从必要性和充分性两方面证明)](/uploads/image/z/7096212-36-2.jpg?t=%E5%85%85%E8%A6%81%E6%9D%A1%E4%BB%B6%E7%9A%84%E8%AF%81%E6%98%8E%E9%97%AE%E9%A2%98%E5%B7%B2%E7%9F%A5ab%E4%B8%8D%E7%AD%89%E4%BA%8E0%2C%E6%B1%82%E8%AF%81%3Aa%2Bb%3D1%E7%9A%84%E5%85%85%E8%A6%81%E6%9D%A1%E4%BB%B6%E6%98%AFa%2Aa%2Aa%2Bb%2Ab%2Ab%2Bab-a%2Aa-b%2Ab%3D0+%28%E6%B3%A8%2A%E4%B8%BA%E4%B9%98%E5%8F%B7%E4%B8%94%E8%A6%81%E4%BB%8E%E5%BF%85%E8%A6%81%E6%80%A7%E5%92%8C%E5%85%85%E5%88%86%E6%80%A7%E4%B8%A4%E6%96%B9%E9%9D%A2%E8%AF%81%E6%98%8E%29)
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