\(\left(1-\dfrac{2}{3}-\dfrac{1}{4}\right)\cdot\left(\dfrac{4}{5}-\dfrac{3}{4}\right)\)
\(=\left(\dfrac{12}{12}-\dfrac{8}{12}-\dfrac{3}{12}\right)\cdot\left(\dfrac{16}{20}-\dfrac{15}{20}\right)\)
\(=\dfrac{12-8-3}{12}\cdot\dfrac{16-15}{20}\)
\(=\dfrac{1}{12}\cdot\dfrac{1}{20}\)
\(=\dfrac{1}{12\cdot20}\)
\(=\dfrac{1}{240}\)
Đúng 1
Bình luận (0)