讨论
1.当x
方程2+【x-1】-【x+3】=0的解有（）个 【】代表绝对值
方程2+【x-1】-【x+3】=0的解有（）个 【】代表绝对值
数学人气：758 ℃时间：2020-04-03 15:56:22
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