Question

a,\(\left(1+\dfrac{2}{3}-\dfrac{1}{4}\right)\cdot\left(\dfrac{4}{5}-\dfrac{3}{4}\right)^2\)

b, \(2:\left(\dfrac{1}{2}-\dfrac{2}{3}\right)\)

Answer 1

a \(\left(\dfrac{12+8-3}{12}\right)\cdot\left(\dfrac{16-15}{20}\right)^2\\ =\dfrac{17}{12}\cdot\dfrac{1}{40}\\ =\dfrac{17}{400}\)

b \(2:\left(\dfrac{1}{2}-\dfrac{2}{3}\right)\\ =2:\left(\dfrac{3-4}{6}\right)\\ =2:\dfrac{1}{6}\\ =2\cdot6=12\)

Answer 2

a. \(\dfrac{17}{480}\\\)nha bạn mình ghi nhầm