\(\left\{{}\begin{matrix}SA\perp\left(ABC\right)\Rightarrow SA\perp BC\\AB\perp BC\left(gt\right)\end{matrix}\right.\) \(\Rightarrow BC\perp\left(SAB\right)\)
Lại có \(BC\in\left(SBC\right)\Rightarrow\left(SBC\right)\perp\left(SAB\right)\)
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