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设△ABC和△A′B′C′的边长分别是:a、b、c和a′、b′、c′,它们的面积记为△和△′,那么将有不等式
Let the sides of △ABC and △A’B’C’ be: a, b, c and a’, b’, c’, and their areas are marked as △ and △’, then there will be inequalities