Question

tính nhanh (3- 1/4 +2/3) -(5-1/3-6/5) -(6-7/4+3/2)

Answer 1

\(\left(3-\dfrac{1}{4}+\dfrac{2}{3}\right)-\left(5-\dfrac{1}{3}-\dfrac{6}{5}\right)-\left(6-\dfrac{7}{4}+\dfrac{3}{2}\right)\)

= \(3-\dfrac{1}{4}+\dfrac{2}{3}-5+\dfrac{1}{3}+\dfrac{6}{5}-6+\dfrac{7}{4}-\dfrac{3}{2}\)

= \(\left(3-5-6\right)+\left(\dfrac{-1}{4}+\dfrac{7}{4}\right)+\left(\dfrac{2}{3}+\dfrac{1}{3}\right)+\left(\dfrac{6}{5}-\dfrac{3}{2}\right)\)

= \(\left(-8\right)+2+1+\dfrac{-3}{10}\)

= \(\left(-5\right)+\dfrac{-3}{10}\)

= \(\dfrac{-53}{10}\) = \(-5,3\)