Câu 5: Trang 62 sách VNEN toán 4
Tính:
$\frac{7}{4}:\frac{1}{5}$; $\frac{5}{9}:4$; $3:\frac{3}{6}$
Bài Làm:
$\frac{7}{4}:\frac{1}{5}=\frac{7}{4}\times \frac{5}{1}=\frac{35}{4}$
$\frac{5}{9}:4=\frac{5}{9}\times \frac{1}{4}=\frac{5}{36}$
$3:\frac{3}{6}=3\times \frac{6}{3}=\frac{18}{3}= 6$