Question

Rút gọn rồi tính (theo mẫu).

Mẫu: \(\dfrac{5}{15}+\dfrac{4}{3}=\dfrac{1}{3}+\dfrac{4}{3}=\dfrac{1+4}{3}=\dfrac{5}{3}\)

a) \(\dfrac{21}{15}+\dfrac{2}{5}\)                      b) \(\dfrac{6}{16}+\dfrac{1}{8}\)                        c) \(\dfrac{3}{12}+\dfrac{3}{4}\)

Answer 1

a) \(\dfrac{21}{15}\) + \(\dfrac{2}{5}\) = \(\dfrac{9}{5}\)
b)  \(\dfrac{6}{16}\) + \(\dfrac{1}{8}\) = \(\dfrac{1}{2}\)

c)  \(\dfrac{3}{12}\) + \(\dfrac{3}{4}\) = 1