Question

x减一绝对值减去x加3的绝对值

Answer 1

|x-1|-|x+3|;
x＜-3时；原式=1-x-(-x-3)=4;
-3≤x≤1时；原式=1-x-(x+3)=-2x-2;
x＞1时；原式=x-1-(x+3)=-4;
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