Work Step by Step
The absolute value of a number $a$ is equal to $a$ if $a\geq0$ and is equal to $-a$ if $a\lt0$. $-1\lt0$, $-2\lt0$, and $-3\lt0$ Therefore, $|-1|+|-2|-|-3|=1+2-3=(1+2)-3=3-3=0$.
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