1.
\(\widehat{xOy}\) = 90o
\(\widehat{xOz}\) = 110o
a) Trên nửa mặt phẳng bờ chứa tia Ox có tia Oy nằm giữa 2 tia Ox và Oz vì \(\widehat{xOy}\) < \(\widehat{xOz}\) (90o < 110o)
2.
a) \(\dfrac{4}{-6}\) và \(\dfrac{7}{4}\)
\(\dfrac{-4}{6}\) và \(\dfrac{7}{4}\) MSC: 12
\(\dfrac{-4}{6}\) = \(\dfrac{-8}{12}\)
\(\dfrac{7}{4}\) = \(\dfrac{21}{12}\)
b) \(\dfrac{3}{5}\) và \(\dfrac{-2}{4}\) MSC: 20
\(\dfrac{3}{5}\) = \(\dfrac{12}{20}\)
\(\dfrac{-2}{4}\) = \(\dfrac{-10}{20}\)
c) \(\dfrac{7}{2}\) = \(\dfrac{2}{3}\) MSC: 6
\(\dfrac{7}{2}\) = \(\dfrac{21}{6}\)
\(\dfrac{2}{3}\) = \(\dfrac{4}{6}\)