Giải câu 2 bài Luyện tập chung (tiếp) sgk Toán 4 trang 138

a) \(\frac{1}{2} \times \frac{1}{4} \times \frac{1}{6} = \frac{1}{2 \times 4} \times \frac{1}{6} = \frac{1}{8} \times \frac{1}{6} = \frac{1}{8 \times 6} = \frac{1}{48}\)

b) \(\frac{1}{2} \times \frac{1}{4} : \frac{1}{6} = \frac{1}{2 \times 4} : \frac{6}{1} = \frac{1}{8} : \frac{1}{6} = \frac{1}{8} \times \frac{6}{1} = \frac{6}{8} = \frac{3}{4}\)

c) \(\frac{1}{2} : \frac{1}{4} \times \frac{1}{6} = \frac{1}{2} \times \frac{4}{1} \times \frac{1}{6}\)

\(= \frac{1 \times 4}{2 \times 1} \times \frac{1}{6}  = \frac{4}{2} \times \frac{1}{6} = \frac{4 \times 1}{2 \times 6} = \frac{4}{12} = \frac{1}{3}\)