Bài 84: trang 43 sgk Toán 6 tập 2
Tính:
| a) \(\frac{-5}{6} \div \frac{3}{13}\) | b) \(\frac{-4}{7} \div \frac{-1}{11}\) |
| c) \(-15 \div \frac{3}{2}\) | d) \(\frac{9}{5} \div \frac{-3}{5}\) |
| e) \(\frac{5}{9} \div \frac{5}{-3}\) | g) \(0 \div \frac{-7}{11}\) |
| h) \(\frac{3}{4} \div (-9)\) |
Bài Làm:
a) \(\frac{-5}{6} \div \frac{3}{13}=\frac{-5}{6}.\frac{13}{3}=\frac{-65}{18}\)
b) \(\frac{-4}{7} \div \frac{-1}{11}=\frac{-4}{7}.(-11)=\frac{44}{7}\)
c) \(-15 \div \frac{3}{2}=-15.\frac{2}{3}=-10\)
d) \(\frac{9}{5} \div \frac{-3}{5}=\frac{9}{5}.\frac{-5}{3}=-3\)
e) \(\frac{5}{9} \div \frac{5}{-3}=\frac{5}{9}.\frac{-3}{5}=\frac{-1}{3}\)
g) \(0 \div \frac{-7}{11}=0\)
h) \(\frac{3}{4} \div (-9)=\frac{3}{4.(-9)}=\frac{-1}{12}\)