1.一元二次方程ax^2+bx+c=0的二根比为2:3,求证:6b^2=25ac2.四边形ABCD四个内角平分线相交组成的四边形EFGM,求证:角GFM=角GEM 3.沿河岸选取相距40米的CD两点,测量河对岸AB两点的距离,测得角ACB=60°

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