Anonymous

Tính: 5/9:7/3

- asked 2 months agoVotes

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Giải Toán lớp 4 Bài 85: Luyện tập

a) $\frac{5}{9} : \frac{7}{3}$

b) $\frac{2}{7} : \frac{8}{5}$

c) $\frac{4}{15} : \frac{2}{3}$

d) $\frac{7}{9} : \frac{21}{9}$

a) $\frac{5}{9} : \frac{7}{3} = \frac{5}{9} \times \frac{3}{7} = \frac{15}{63} = \frac{5}{21}$

b) $\frac{2}{7} : \frac{8}{5} = \frac{2}{7} \times \frac{5}{8} = \frac{10}{56} = \frac{5}{28}$

c) $\frac{4}{15} : \frac{2}{3} = \frac{4}{15} \times \frac{3}{2} = \frac{12}{60} = \frac{1}{5}$

d) $\frac{7}{9} : \frac{21}{9} = \frac{7}{9} \times \frac{9}{21} = \frac{1}{3}$