Bài 59: trang 33 sgk Toán 6 tập 2
Tính:
| a) \(\frac{1}{8}-\frac{1}{2}\) | b) \(\frac{-11}{12}-(-1)\) | c) \(\frac{3}{5}-\frac{5}{6}\) |
| d) \(\frac{-1}{16}-\frac{1}{15}\) | e) \(\frac{11}{36}-\frac{-7}{24}\) | g) \(\frac{-5}{9}-\frac{-5}{12}\) |
Bài Làm:
a) \(\frac{1}{8}-\frac{1}{2}=\frac{1}{8}+\left (-\frac{1}{2} \right )=\frac{1}{8}+\frac{-4}{8}=\frac{-3}{8}\)
b) \(\frac{-11}{12}-(-1)=\frac{-11}{12}+1=\frac{-11}{12}+\frac{12}{12}=\frac{1}{12}\)
c) \(\frac{3}{5}-\frac{5}{6}=\frac{3}{5}+\left (-\frac{5}{6} \right )=\frac{18}{30}+\frac{-25}{30}=\frac{-7}{30}\)
d) \(\frac{-1}{16}-\frac{1}{15}=\frac{-15}{240}+\frac{-16}{240}=\frac{-31}{240}\)
e) \(\frac{11}{36}-\frac{-7}{24}=\frac{22}{72}+\frac{21}{72}=\frac{43}{72}\)
g) \(\frac{-5}{9}-\frac{-5}{12}=\frac{-20}{36}+\frac{15}{36}=\frac{-5}{36}\)