Question

tính 20% + \(\dfrac{2}{3}\) +1.8+ 2\(\dfrac{1}{3}\) 

Answer 1

\(20\%+\dfrac{2}{3}+1,8+2\dfrac{1}{3}\\ =\dfrac{1}{5}+\dfrac{2}{3}+\dfrac{9}{5}+\dfrac{7}{3}\\ =\left(\dfrac{1}{5}+\dfrac{9}{5}\right)+\left(\dfrac{2}{3}+\dfrac{7}{3}\right)\\ =\dfrac{10}{5}+\dfrac{9}{3}\\ =2+3\\ =5\)