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数学7上：数轴上P对应的数字是x，如何化简｜2x+4｜+2｜x-5｜-｜6-x｜？
数学7上：数轴上P对应的数字是x，如何化简|2x+4|+2|x-5|-|6-x|？
初中数学，数轴动点问题，绝对值最值，基础训练，培优专题28/100
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