Question

Tính hợp lí nếu có thể

a)1/2.(2/9+3/7-5/27)

b)1/2+3/4-(3/4-4/5)

c)1/3.5/7-7/27.36/14

Answer 1

a: \(=\dfrac{1}{2}\cdot\dfrac{2\cdot21+3\cdot27-5\cdot7}{189}\)

\(=\dfrac{1}{2}\cdot\dfrac{88}{189}=\dfrac{44}{189}\)

b: \(=\dfrac{1}{2}+\dfrac{3}{4}-\dfrac{3}{4}+\dfrac{4}{5}=\dfrac{1}{2}+\dfrac{4}{5}=\dfrac{13}{10}\)

c: \(=\dfrac{5}{21}-\dfrac{7}{14}\cdot\dfrac{36}{27}=\dfrac{5}{21}-\dfrac{1}{2}\cdot\dfrac{4}{3}=\dfrac{5}{21}-\dfrac{2}{3}=\dfrac{5-14}{21}=\dfrac{-9}{21}=\dfrac{-3}{7}\)