Bài 210:
a: \(\dfrac{1}{2}-\dfrac{1}{8}=\dfrac{4}{8}-\dfrac{1}{8}=\dfrac{3}{8}\)
b: 17/18-5/6=17/18-15/18=2/18=1/9
c: \(\dfrac{2}{3}-\dfrac{4}{9}=\dfrac{6}{9}-\dfrac{4}{9}=\dfrac{2}{9}\)
d: 2/3-1/6=4/6-1/6=3/6=1/2
e: \(\dfrac{7}{10}-\dfrac{1}{5}=\dfrac{7}{10}-\dfrac{2}{10}=\dfrac{5}{10}=\dfrac{1}{2}\)
g: 8/15-2/5=8/15-6/15=2/15
