Question

Tính rồi rút gọn (theo mẫu):

Mẫu: \(\dfrac{9}{10}-\dfrac{4}{10}=\dfrac{9-4}{10}=\dfrac{5}{10}=\dfrac{1}{2}\)

a) \(\dfrac{15}{8}-\dfrac{13}{8}\)                      b) \(\dfrac{7}{15}-\dfrac{2}{15}\)                   c) \(\dfrac{11}{12}-\dfrac{2}{12}\)                  d) \(\dfrac{19}{7}-\dfrac{5}{7}\)

 

Answer 1

a: \(\dfrac{15}{8}-\dfrac{13}{8}=\dfrac{15-13}{8}=\dfrac{2}{8}=\dfrac{1}{4}\)

b: \(\dfrac{7}{15}-\dfrac{2}{15}=\dfrac{7-2}{15}=\dfrac{5}{15}=\dfrac{1}{3}\)

c: \(\dfrac{11}{12}-\dfrac{2}{12}=\dfrac{11-2}{12}=\dfrac{9}{12}=\dfrac{3}{4}\)

d: \(\dfrac{19}{7}-\dfrac{5}{7}=\dfrac{19-5}{7}=\dfrac{14}{7}=2\)