Question

6 tính: a) 4/5+1/5:2/5=                          b) 5/6:5 nhân 2/5

Answer 1

a: \(=\dfrac{4}{5}+\dfrac{1}{5}\cdot\dfrac{5}{2}=\dfrac{4}{5}+\dfrac{1}{2}=\dfrac{8}{10}+\dfrac{5}{10}=\dfrac{13}{10}\)

b: \(=\dfrac{5}{6}\cdot\dfrac{1}{5}\cdot\dfrac{2}{5}=\dfrac{1}{6}\cdot\dfrac{2}{5}=\dfrac{2}{30}=\dfrac{1}{15}\)

Answer 2

a) \(=\dfrac{13}{10}\)

b) \(=\dfrac{1}{15}\)

Answer 3

a)\(\dfrac{13}{10}\)

b)\(\dfrac{1}{15}\)

Answer 4

\(a,\dfrac{4}{5}+\dfrac{1}{5}:\dfrac{2}{5}=\dfrac{4}{5}+\dfrac{1}{2}=\dfrac{13}{10}\\ b,\dfrac{5}{6}:5\times\dfrac{2}{5}=\dfrac{5}{30}\times\dfrac{2}{5}=\dfrac{10}{150}=\dfrac{1}{15}\)

Answer 5

a)\(\dfrac{4}{5}+\dfrac{1}{5}:\dfrac{2}{5}=\dfrac{4}{5}+\dfrac{1}{2}=\dfrac{13}{10}\)

b)\(\dfrac{5}{6}:5\)x\(\dfrac{2}{5}\)=\(\dfrac{1}{6}\)x\(\dfrac{2}{5}\)=\(\dfrac{1}{15}\)