||x-1|-3|+|3x+1|
当x≥4,则:x-4+3x+1=4x-3
当-2≤x≤-1/3则:|1-x-3|-3x-1=2+x-3x-1=1-2x
当x≤-2.则:-x-2-3x-1=-4x-3
当1≤x≤4,则|x-1-3|+3x+1=4-x+3x+1=5-2x
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