Question

2 và 1/2+ 5 và 1/3 - 4 và 3/4

Answer 1

\(2\dfrac{1}{5}+5\)= 2+\(\dfrac{1}{5}\)+5= 2+5 +\(\dfrac{1}{5}\)=7+\(\dfrac{1}{5}\)=\(7\dfrac{1}{5}\)(nếu đổi ra p/s = \(\dfrac{36}{5}\))

\(\dfrac{1}{3}-4\dfrac{3}{4}\)=\(\dfrac{1}{3}-\dfrac{19}{4}=\dfrac{4}{12}-\dfrac{57}{12}=\dfrac{-53}{12}\)

Answer 2

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

\(=\dfrac{5}{2}+\dfrac{16}{3}-\dfrac{19}{4}\)

\(=\dfrac{30+64-57}{12}=\dfrac{37}{12}\)

Answer 3

\(2\dfrac{1}{2}+5\dfrac{1}{3}-4\dfrac{3}{4}=\dfrac{5}{2}+\dfrac{16}{3}-\dfrac{19}{4}=\dfrac{30}{12}+\dfrac{64}{12}-\dfrac{57}{12}=\)\(\dfrac{94}{12}-\dfrac{57}{12}=\dfrac{37}{12}=\)