y=绝对值(x-1) 等价于y=x-1 (x≥1)或y=1-x (x≤1)
y=x-1 (x≥1)是增函数 y=1-x (x≤1)是减函数
所以y=绝对值(x-1) 的单调递增区间是 (x≥1)即[1,+∞)
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