Bài 1:
a) \(\dfrac{1}{2}+\dfrac{1}{4}=\dfrac{3}{4}\)
b) \(\dfrac{1}{2}+\dfrac{1}{3}=\dfrac{5}{6}\)
c) \(\dfrac{1}{5}+\dfrac{1}{6}=\dfrac{11}{30}\)
Bài 2:
a) \(\dfrac{1}{6}+\dfrac{1}{3}+\dfrac{1}{12}=\dfrac{7}{12}\)
b) \(\dfrac{1}{15}+\dfrac{1}{30}+\dfrac{1}{3}=\dfrac{13}{30}\)
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