1.已知a、b、c是△ABC的三条边,说明a^2-2ab+b^2-c^2的值小于0.2.a、b、c是△ABC的三条边,且满足a^4-a^2b^2=b^4-b^2c^2,判断△ABC的形状.3.若a^2(b-c)+b^2(c-a)+c^2(a-b)=0,求证a、b、c三数中至少有两数相等.4.-(-a^2
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