Question

làm tính cộng các phân số sau :

i) \(\dfrac{2}{7}+\dfrac{3}{7}\) ii)\(\dfrac{3}{5}+\dfrac{2}{3}\)

Answer 1

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

ii)\(\dfrac{3}{5}+\dfrac{2}{3}=\dfrac{9}{15}+\dfrac{10}{15}=\dfrac{19}{15}\)

Answer 2

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

\(\dfrac{3}{5}\)+ \(\dfrac{2}{3}\)= \(\dfrac{9}{15}\)+ \(\dfrac{10}{15}\)= \(\dfrac{19}{15}\)

Answer 3

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

b)\(\dfrac{3}{5}+\dfrac{2}{3}=\dfrac{9}{15}+\dfrac{10}{15}=\dfrac{19}{15}\)