Bài tập 2 trang 72 toán lớp 4 tập 2 Cánh diều:Tính:a) $\frac{5}{9} :\frac{7}{3}$b)...

{
"content1": {
"a": "a) $\frac{5}{9} : \frac{7}{3} = \frac{5}{9} \times \frac{3}{7} = \frac{15}{63} = \frac{5}{21}$",
"b": "b) $\frac{2}{7} : \frac{8}{5} = \frac{2}{7} \times \frac{5}{8} = \frac{10}{56} = \frac{5}{28}$",
"c": "c) $\frac{4}{15} : \frac{2}{5} = \frac{4}{15} \times \frac{5}{2} = \frac{20}{30} = \frac{2}{3}$",
"d": "d) $\frac{7}{9} : \frac{21}{9} = \frac{7}{9} \times \frac{9}{21} = \frac{63}{189} = \frac{1}{3}$"
},
"content2": {
"a": "a) $\frac{5}{9} : \frac{7}{3} = \frac{5}{9} \div \frac{7}{3} = \frac{5}{9} \times \frac{3}{7} = \frac{15}{63} = \frac{5}{21}$",
"b": "b) $\frac{2}{7} : \frac{8}{5} = \frac{2}{7} \div \frac{8}{5} = \frac{2}{7} \times \frac{5}{8} = \frac{10}{56} = \frac{5}{28}$",
"c": "c) $\frac{4}{15} : \frac{2}{5} = \frac{4}{15} \div \frac{2}{5} = \frac{4}{15} \times \frac{5}{2} = \frac{20}{30} = \frac{2}{3}$",
"d": "d) $\frac{7}{9} : \frac{21}{9} = \frac{7}{9} \div \frac{21}{9} = \frac{7}{9} \times \frac{9}{21} = \frac{63}{189} = \frac{1}{3}$"
},
"content3": {
"a": "a) $\frac{5}{9} : \frac{7}{3} = \frac{5}{9} \div \frac{7}{3} = \frac{5}{9} \times \frac{3}{7} = \frac{15}{63} = \frac{5}{21}$",
"b": "b) $\frac{2}{7} : \frac{8}{5} = \frac{2}{7} \div \frac{8}{5} = \frac{2}{7} \times \frac{5}{8} = \frac{10}{56} = \frac{5}{28}$",
"c": "c) $\frac{4}{15} : \frac{2}{5} = \frac{4}{15} \div \frac{2}{5} = \frac{4}{15} \times \frac{5}{2} = \frac{20}{30} = \frac{2}{3}$",
"d": "d) $\frac{7}{9} : \frac{21}{9} = \frac{7}{9} \div \frac{21}{9} = \frac{7}{9} \times \frac{9}{21} = \frac{63}{189} = \frac{1}{3}$"
},
"content4": {
"a": "a) $\frac{5}{9} : \frac{7}{3} = \frac{5}{9} \div \frac{7}{3} = \frac{5}{9} \times \frac{3}{7} = \frac{15}{63} = \frac{5}{21}$",
"b": "b) $\frac{2}{7} : \frac{8}{5} = \frac{2}{7} \div \frac{8}{5} = \frac{2}{7} \times \frac{5}{8} = \frac{10}{56} = \frac{5}{28}$",
"c": "c) $\frac{4}{15} : \frac{2}{5} = \frac{4}{15} \times \frac{5}{2} = \frac{20}{30} = \frac{2}{3}$",
"d": "d) $\frac{7}{9} : \frac{21}{9} = \frac{7}{9} \div \frac{21}{9} = \frac{7}{9} \times \frac{9}{21} = \frac{63}{189} = \frac{1}{3}$"
}
}