Câu 1: Sa Pa is known for its beautiful mountains and valleys

a) 0,75 + \(\dfrac{9}{5}\) (1,5 - \(\dfrac{2}{3}\))\(^2\) = 0,75 + \(\dfrac{9}{5}\) (\(\dfrac{3}{2}\) - \(\dfrac{2}{3}\))\(^2\) =  0,75 + \(\dfrac{9}{5}\) \(\left(\dfrac{9}{6}-\dfrac{4}{6}\right)^2\)= 0,75 + \(\dfrac{9}{5}\)\(.\dfrac{5}{6}^2\)= 0,75 + \(\dfrac{9}{5}\)\(.\dfrac{25}{36}\)= 0,75 + \(\dfrac{5}{4}\) = \(\dfrac{3}{4}+\dfrac{5}{4}=\dfrac{8}{4}=\dfrac{2}{1}=2\)

b)\(\dfrac{-22}{25}+\left(\dfrac{22}{7}-0,12\right)\)\(=\dfrac{-22}{25}+\left(\dfrac{22}{7}-\dfrac{3}{25}\right)=\dfrac{-22}{25}+\left(\dfrac{550}{175}-\dfrac{21}{175}\right)=\dfrac{-22}{25}+\dfrac{529}{175}=\dfrac{-550}{175}+\dfrac{529}{175}=\dfrac{-21}{175}=\dfrac{-3}{25}\)