Question

Giúp mình với

Answer 1

\(\dfrac{2}{5}+\dfrac{3}{10}-\dfrac{1}{2}=\dfrac{4}{10}+\dfrac{3}{10}-\dfrac{1}{2}=\dfrac{7}{10}-\dfrac{1}{2}=\dfrac{7}{10}-\dfrac{5}{10}=\dfrac{2}{10}=\dfrac{1}{5}\)

Answer 2

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

c) \(\dfrac{8}{11}+\dfrac{8}{33}\times\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{24}{132}=\dfrac{8}{11}+\dfrac{2}{11}=\dfrac{10}{11}\)

Answer 3

b) 

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

c)

\(=\dfrac{8}{11}+\dfrac{2}{11}=\dfrac{10}{11}\)

Answer 4

`2/5 + 3/10 - 1/2 = 4/5 + 3/10 - 5/10 = 1/5`

 

Answer 5

\(b.\dfrac{2}{5}+\dfrac{3}{10}-\dfrac{1}{2}=\dfrac{4}{10}+\dfrac{3}{10}-\dfrac{1}{2}=\dfrac{7}{10}-\dfrac{1}{2}=\dfrac{7}{10}-\dfrac{5}{10}=\dfrac{2}{10}=\dfrac{1}{5}\)

\(c.\dfrac{8}{11}+\dfrac{8}{33}\times\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{2}{11}=\dfrac{10}{11}\)