已知:A=a²+2b²-3c²+4,B=b²-2c²-3a².C=-5²-2a²+3b².试说明:A+B+C的值与a、b、c无关
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![已知:A=a²+2b²-3c²+4,B=b²-2c²-3a².C=-5²-2a²+3b².试说明:A+B+C的值与a、b、c无关](/uploads/image/z/1835492-68-2.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9AA%3Da%26%23178%3B%2B2b%26%23178%3B-3c%26%23178%3B%2B4%2CB%3Db%26%23178%3B-2c%26%23178%3B-3a%26%23178%3B.C%3D-5%26%23178%3B-2a%26%23178%3B%2B3b%26%23178%3B.%E8%AF%95%E8%AF%B4%E6%98%8E%3AA%2BB%2BC%E7%9A%84%E5%80%BC%E4%B8%8Ea%E3%80%81b%E3%80%81c%E6%97%A0%E5%85%B3)
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已知:A=a²+2b²-3c²+4,B=b²-2c²-3a².C=-5²-2a²+3b².试说明:A+B+C的值与a、b、c无关
已知:A=a²+2b²-3c²+4,B=b²-2c²-3a².C=-5²-2a²+3b².试说明:A+B+C的值与a、b、c无关
已知:A=a²+2b²-3c²+4,B=b²-2c²-3a².C=-5²-2a²+3b².试说明:A+B+C的值与a、b、c无关
A+B+C=-21,与a、b、c无关