1、已知a、b、c为三角形ABC的三边长,是确定a²-b²-c²-2bc的符号.2、已知x+y=3,求x³+9xy+y³的值.3、若m、n被9除的余数分别为3、2,试说明8m³-27n³能被9整除.4、已知y²+ky-24=(y
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![1、已知a、b、c为三角形ABC的三边长,是确定a²-b²-c²-2bc的符号.2、已知x+y=3,求x³+9xy+y³的值.3、若m、n被9除的余数分别为3、2,试说明8m³-27n³能被9整除.4、已知y²+ky-24=(y](/uploads/image/z/11228309-53-9.jpg?t=1%E3%80%81%E5%B7%B2%E7%9F%A5a%E3%80%81b%E3%80%81c%E4%B8%BA%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E4%B8%89%E8%BE%B9%E9%95%BF%2C%E6%98%AF%E7%A1%AE%E5%AE%9Aa%26sup2%3B-b%26sup2%3B-c%26sup2%3B-2bc%E7%9A%84%E7%AC%A6%E5%8F%B7.2%E3%80%81%E5%B7%B2%E7%9F%A5x%2By%3D3%2C%E6%B1%82x%26sup3%3B%2B9xy%2By%26sup3%3B%E7%9A%84%E5%80%BC.3%E3%80%81%E8%8B%A5m%E3%80%81n%E8%A2%AB9%E9%99%A4%E7%9A%84%E4%BD%99%E6%95%B0%E5%88%86%E5%88%AB%E4%B8%BA3%E3%80%812%2C%E8%AF%95%E8%AF%B4%E6%98%8E8m%26sup3%3B-27n%26sup3%3B%E8%83%BD%E8%A2%AB9%E6%95%B4%E9%99%A4.4%E3%80%81%E5%B7%B2%E7%9F%A5y%26sup2%3B%2Bky-24%3D%EF%BC%88y)
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