Question

giúp em với ạ em cần gấp ạ

Answer 1

a) Ta có:

\(\widehat{yOu}+\widehat{xOy}=180^o\) (kề bù) 

\(\Rightarrow\widehat{yOu}=180^o-\widehat{xOy}\)

\(\Rightarrow\widehat{yOu}=180^o-60^o=120^o\) 

Mà: \(\widehat{xOt}+\widehat{tOu}=180^o\) (kề bù) 

\(\Rightarrow\widehat{xOt}=180^o-\widehat{tOu}\)

\(\Rightarrow\widehat{xOt}=180^o-30^o=150^o\)

b) Ta có:

\(\widehat{xOy}+\widehat{yOt}+\widehat{tOu}=\widehat{xOu}\)

\(\Rightarrow\widehat{yOt}=\widehat{xOu}-\widehat{xOy}-\widehat{tOu}\)

\(\Rightarrow\widehat{yOt}=180^o-60^o-30^o\)

\(\Rightarrow\widehat{yOt}=90^o\)