Tính:

${\text{a) }}\frac{5}{6} \times \frac{1}{{10}} = ....................{\text{         }}$

$\frac{3}{8} \times \frac{4}{9} = ....................{\text{      }}$

${\text{b) }}\frac{7}{9} \times \frac{9}{7} = ....................{\text{           }}$

$\frac{{11}}{{15}} \times \frac{5}{{22}} = ....................{\text{              }}$

Tính:

${\text{a) }}\frac{1}{2} \times 3 = ....................{\text{    }}$

$\frac{2}{3} \times 4 = ....................{\text{        }}$

${\text{b) }}12 \times \frac{1}{5} = ....................{\text{            }}$

$11 \times \frac{2}{9} = ....................{\text{              }}$

Khoanh vào chữ đặt trước câu trả lời đúng:

Khoanh vào chữ đặt trước câu trả lời đúng:

Tính:

${\text{a) }}\frac{5}{2}:\frac{3}{7} = ....................{\text{ }}$

$\frac{1}{2}:\frac{1}{4} = ....................{\text{        }}$

${\text{b) }}\frac{3}{5}:\frac{1}{5} = ....................{\text{             }}$

$\frac{5}{9}:\frac{4}{3} = ....................{\text{              }}$