$\text{Đáp án + Giải thích các bước giải:}$
`\text{Vì}` `\hat{xOy}` `\text{và}` `\hat{yOz}` `\text{là 2 góc kề bù}`
`=>` `\hat{xOy}` `+` `\hat{yOz}` `=180^{o}`
`=>` `5.\hat{yOz}` `+` `\hat{yOz}` `=180^{o}`
`=>` `6.\hat{yOz}` `=180^{o}`
`=>` `\hat{yOz}` `=(180^{o})/(6)=30^{o}`
`\text{Mà}` `\hat{xOy}=5.\hat{yOz}`
`=>\hat{xOy}=5.30^{o}=150^{o}`
`\text{Vậy}` `\hat{yOz}=30^{o}`
`\hat{xOy}=150^{o}`