Question

tính

Answer 1

\(=\dfrac{38}{35}-\dfrac{7}{10}=\dfrac{27}{70}\)

Answer 2

\(k,\dfrac{4}{5}-\left(-\dfrac{2}{7}\right)-\dfrac{7}{10}=\dfrac{4}{5}+\dfrac{2}{7}-\dfrac{7}{10}=\dfrac{38}{35}-\dfrac{7}{10}=\dfrac{27}{70}\)

Answer 3

\(k,=\dfrac{4}{5}+\dfrac{2}{7}-\dfrac{7}{10}\\ =\dfrac{4.14+2.10-7.7}{70}=\dfrac{56+20-49}{70}=\dfrac{76-49}{70}=\dfrac{27}{70}\)

Answer 4

k) \(\dfrac{4}{5}-\left(-\dfrac{2}{7}\right)-\dfrac{7}{10}\)

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

\(=\dfrac{28}{35}+\dfrac{10}{35}-\dfrac{7}{10}\)

\(=\dfrac{38}{35}-\dfrac{7}{10}\)

\(=\dfrac{76}{70}-\dfrac{49}{70}=\dfrac{27}{70}\)

Answer 5

= \(\dfrac{38}{35}-\dfrac{7}{10}\)

= \(\dfrac{27}{70}\)