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Chào bạn !! Để braga giúp bạn bài này nhé !
[TEX]\frac{1}{5}\widehat{xOz}=\frac{1}{4}\widehat{yOz} \rightarrow \widehat{xOz}= \frac{5}{4}\widehat{yOz}[/TEX]
Mặt khác ta có: [TEX]\widehat{xOz}+\widehat{yOz}=90^o[/TEX]( do Oz nằm giữa Ox và Oy)
[TEX]\leftrightarrow \frac{5}{4}\widehat{yOz}+\widehat{yOz}=90^o \rightarrow \frac{9}{4}\widehat{yOz}=90^o \\\\ \rightarrow \widehat{yOz}=90^o:\frac{9}{4}=40^o \rightarrow \widehat{xOz}=\frac{5}{4}\widehat{yOz}=\frac{5}{4}.40^o=50^o[/TEX]