有些大数值问题可以通过用字母代替数转化成若x=123456789×123456786,y=123456788×123456787,试比较x、y的大小.设123456788=a,那么x=(a+1)(a-2)=a2-a-2,y=a(a-1)=a2-a,∵x-y=(a2-a-2)-(a2-a)=-2<0,∴x<y
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![有些大数值问题可以通过用字母代替数转化成若x=123456789×123456786,y=123456788×123456787,试比较x、y的大小.设123456788=a,那么x=(a+1)(a-2)=a2-a-2,y=a(a-1)=a2-a,∵x-y=(a2-a-2)-(a2-a)=-2<0,∴x<y](/uploads/image/z/4738257-9-7.jpg?t=%E6%9C%89%E4%BA%9B%E5%A4%A7%E6%95%B0%E5%80%BC%E9%97%AE%E9%A2%98%E5%8F%AF%E4%BB%A5%E9%80%9A%E8%BF%87%E7%94%A8%E5%AD%97%E6%AF%8D%E4%BB%A3%E6%9B%BF%E6%95%B0%E8%BD%AC%E5%8C%96%E6%88%90%E8%8B%A5x%3D123456789%C3%97123456786%2Cy%3D123456788%C3%97123456787%2C%E8%AF%95%E6%AF%94%E8%BE%83x%E3%80%81y%E7%9A%84%E5%A4%A7%E5%B0%8F%EF%BC%8E%E8%AE%BE123456788%3Da%2C%E9%82%A3%E4%B9%88x%3D%EF%BC%88a%2B1%EF%BC%89%EF%BC%88a-2%EF%BC%89%3Da2-a-2%2Cy%3Da%EF%BC%88a-1%EF%BC%89%3Da2-a%2C%E2%88%B5x-y%3D%EF%BC%88a2-a-2%EF%BC%89-%EF%BC%88a2-a%EF%BC%89%3D-2%EF%BC%9C0%2C%E2%88%B4x%EF%BC%9Cy)
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