Question

Cau 1:Lam tinh cong cac phan so sau:

a,2/7+3/7=

b,3/5+2/3=

Answer 1

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

Answer 2

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

Answer 3

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

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