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老何讲数学121：巧妙构造三角形求最值
构造三角形求最值是最常见方法之一，构造过程中要满足三点要求，你知道吗？
九年级求最值经典习题5/20
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构造三角形求最值是最常见方法之一，构造过程中要满足三点要求，你知道吗？
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