Question

tính bằng cách thuận tiện nhất: 5/3+(-2/7)-(-1,2). Giúp mk vs ko biết làm sao cho nó tiện nhất nữa.

Answer 1

\(\dfrac{5}{3}+\left(\dfrac{-2}{7}\right)-\left(\dfrac{-1}{2}\right)\)

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

= \(\dfrac{70}{42}-\dfrac{12}{42}+\dfrac{21}{42}\)

= \(\dfrac{79}{42}\)

Answer 2

\(\dfrac{5}{3}+\dfrac{-2}{7}-\dfrac{-1}{2}=\dfrac{98}{42}-\dfrac{12}{42}+\dfrac{21}{42}=\dfrac{107}{42}\)