Đáp án:

 

Giải thích các bước giải:

Như hình nha

a,

Ta thấy: $\widehat{xOy}<\widehat{xOz}(65^o<125^o)$

⇒$Oy$ nằm giữa 2 tia $Ox,Oz$

⇒: $\widehat{xOy}+\widehat{yOz}=\widehat{xOz}$

Hay $65^o+\widehat{yOz}=125^o$

⇒$\widehat{yOz}=60^o$

b,

Không vì $\widehat{xOy}\neq \widehat{yOz}$

c,

Ta có: $\widehat{zOy}+\widehat{vOz}=180^o$

⇒$60^o+\widehat{vOz}=180^o$

⇒$\widehat{vOz}=120^o$

⇒$\widehat{xOy}+\widehat{vOx}=\widehat{vOy}=180^o$

⇒$65^o+\widehat{vOx}=180^o$
⇔$\widehat{vOx}=115^o$

d,

Ta có:

$Ot$ nằm giữa $Oy;Oz$

$Oy$ nằm giữa $Ox;Oz$

⇒$Ot$ nằm giữa $Oz;Ox$
⇒$\widehat{xOt}+\widehat{zOt}=\widehat{zOx}$

⇒$\widehat{xOt}+\dfrac{1}{2}\widehat{yOz}=\widehat{zOx}$

⇒$\widehat{xOt}+\dfrac{1}{2}60^o=125^o$

⇒$\widehat{xOt}+30^o=125^o$

⇒$\widehat{xOt}=95^o$