@SANGOFFICIAL
$\frac{3}{11}$ + $\frac{7}{11}$
= $\frac{3+7}{11}$
= $\frac{10}{11}$
$\frac{4}{9}$ - $\frac{2}{9}$
= $\frac{4-2}{9}$
= $\frac{2}{9}$
$\frac{1}{5}$ + $\frac{3}{10}$
= $\frac{2}{10}$ + $\frac{3}{10}$
= $\frac{2+3}{10}$
=$\frac{1}{2}$
9 + $\frac{1}{7}$
= $\frac{63}{7}$ + $\frac{1}{7}$
= $\frac{63}{7}$ + $\frac{1}{7}$
= $\frac{63+1}{7}$
= $\frac{64}{7}$
5 - $\frac{3}{7}$
= $\frac{35}{7}$ - $\frac{3}{7}$
= $\frac{35-3}{7}$
= $\frac{32}{7}$
$\frac{1}{9}$ × $\frac{7}{3}$
= $\frac{1×7}{9×3}$
= $\frac{7}{27}$
$\frac{2}{5}$ ÷ $\frac{4}{7}$
= $\frac{2}{5}$ × $\frac{7}{4}$
= $\frac{2×7}{5×4}$
= $\frac{14}{20}$
= $\frac{7}{10}$
DO MÌNH GIẢI RA RẤT CHI TIẾT NÊN MONG BẠN CHO MÌNH CÂU TRẢ LỜI HAY NHẤT Ạ
