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去掉最外層絕對值符號得: |||x-1|-2|-3|-4=0|||x-1|-2|-3|=4即||x-1|-2|-3=4,或||x-1|-2|-3=-4(舍去)得:||x-1|-2|=7|x-1|-2=7或|x-1|-2=-7(舍去)得|x-1|=9得x-1=9或x-1=-9得x=10或-8
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