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中学生数理化:高二高三版, ISSN 1001-6953, 2018, Issue 4, pp. 8 - 8
柯西不等式的二维形式为(a^2+b^2)·(c^2+d^2)≥(aC+bd)^2,当且仅当ad=bc时取等号。 
中学 | 柯西不等式 | 数学教学 | 教材
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