Question

Làm ơn chỉ cho mình bài này này

Answer 1

a) Ta có \(\widehat{xOy}+\widehat{xOy'}=180^o=>\dfrac{2}{3}\widehat{xOy'}+\widehat{xOy'}=180^o\)
\(\dfrac{5}{3}\widehat{xOy'}=180^o=>\widehat{xOy'}=108^o\)
=> Chọn C
b) Ta có \(\widehat{xOy'}+\widehat{xOy}=180^o=>\widehat{xOy'}=120^o\)
Mà \(\widehat{xOy'}=\widehat{x'Oy}=>\widehat{xOy'}+\widehat{x'Oy}=240^o\)
=> Chọn D