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若不等式2｜x-1｜+3｜x-3｜≤a，求实数a的最小值是多少？零点分段法
若不等式2|x-1|+3|x-3|≤a，求实数a的最小值是多少？
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆245/333
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