Let $a$ be fixed.
If $b \in (-\infty, \infty)$ in $z=a+bi$,
then how to mark the range of $z$?
2026-03-18 23:02:47.1773874967
If $b \in (-\infty, \infty)$ in $z=a+bi$, then how to mark the range of $z$?
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