Tính: a) : b) : c) :

a) : = x = = b) : = x = = c) : = x = =

Câu 2: Trang 136 sgk toán lớp 4

Gửi bởi: Nguyễn Thị Ngọc Vào 22 tháng 4 2019 lúc 10:18:22

Tính:

a) \(\frac{3}{7}\) : \(\frac{5}{8}\)

b) \(\frac{8}{7}\) : \(\frac{3}{4}\)

c) \(\frac{1}{3}\) : \(\frac{1}{2}\)

a) \(\frac{3}{7}\) : \(\frac{5}{8}\) = \(\frac{3}{7}\) x \(\frac{8}{5}\) = \(\frac{3 \times 8}{7 \times 5}\) = \(\frac{24}{35}\)

b) \(\frac{8}{7}\) : \(\frac{3}{4}\) = \(\frac{8}{7}\) x \(\frac{4}{3}\) = \(\frac{8 \times 4}{7 \times 3}\) = \(\frac{32}{21}\)

c) \(\frac{1}{3}\) : \(\frac{1}{2}\) = \(\frac{1}{3}\) x \(\frac{2}{1}\) = \(\frac{1 \times 2}{3 \times 1}\) = \(\frac{2}{3}\)