Question

[chăm ngoan học giỏi]

\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}\)

\(\frac{12}{17}-\frac{5}{17}-\frac{4}{17}\)

Answer 1

[Nguyễn Tuấn Minh]

7/12-2/7+1/12=7/12+1/12-2/7=8/12-2/7=2/3+2/7=14/21+6/21=20/21

12/17-5/17-4/17=3/17