10/15 - 2/5 = 10/15 - 6/15 = 4/15
\(\dfrac{10}{15}-\dfrac{2}{5}\)
\(=\dfrac{10}{15}-\dfrac{6}{15}\)
\(=\dfrac{4}{15}\)
\(\dfrac{10}{15}-\dfrac{2}{5}=\dfrac{10}{15}-\dfrac{6}{15}=\dfrac{4}{15}\)
= 10/15 - 6/15
= 4/15
Vậy giá trị biểu thức là 4/15
10/15 - 2/5 = 10/15 - 6/15 = 4/15