Question

[Nguyet Tran]

a.\(\dfrac{2}{7}\) x \(\dfrac{4}{3}\) + \(\dfrac{2}{6}\)

B.\(\dfrac{4}{7}\) : 2 + \(\dfrac{4}{7}\)

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

Answer 1

[Nguyễn Ngọc Khánh Huyền]

a) ^{_{\(\dfrac{2}{7}\times\dfrac{4}{3}+\dfrac{2}{6}\)}}

^{_{\(=\dfrac{8}{21}+\dfrac{2}{6}\)}}

^{_{\(=\dfrac{5}{7}\)}}

b) ^{_{\(\dfrac{4}{7}:2+\dfrac{4}{7}\)}}

^{_{\(=\dfrac{2}{7}+\dfrac{4}{7}\)}}

^{_{\(=\dfrac{6}{7}\)}}

c) ^{_{\(\dfrac{1}{3}+\dfrac{3}{4}-\dfrac{1}{5}:\dfrac{2}{3}\)}}

^{_{\(=\dfrac{13}{12}-\dfrac{3}{10}\)}}

^{_{\(=\dfrac{47}{60}\)}}

Answer 2

[I don't Know]

a \(\dfrac{8}{21}+\dfrac{2}{6}=\dfrac{16}{42}+\dfrac{14}{42}=\dfrac{30}{42}=\dfrac{5}{7}\)

\(b\) \(\dfrac{4}{7}\times\dfrac{1}{2}+\dfrac{4}{7}=\dfrac{2}{7}+\dfrac{4}{7}=\dfrac{6}{7}\)

\(c\) \(\dfrac{1}{3}+\dfrac{3}{4}-\dfrac{1}{5}\times\dfrac{3}{2}=\dfrac{1}{3}+\dfrac{3}{4}-\dfrac{3}{10}=\dfrac{20}{60}+\dfrac{45}{60}-\dfrac{18}{60}=\dfrac{47}{60}\)