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1.引入如果ax~2+bz+c=0是关于x的恒等式,求证:a=b=c.分析所谓ax~2+bz+c=0是关于x的恒等式,就是说对于任意实数x,这个等式总成
1. Introduce if ax~2+bz+c=0 is an identity about x, verify: a=b=c. Analyze so called ax~2+bz+c=0 is an identity about x, that is, for any real number x This equation assembly