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若a的絕對值=2, 則有|a|=2, 解得a=2或-2, 若a-2的絕對值=1, 則有|a-2|=1, 即為a-2=1或者a-2=-1, 解得a=3或1 若a-3的絕對值=3-a, 則有|a-3|=3-a, 即為a-3≤0, 記得a≤3
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