Câu 2: Trang 62 sách VNEN toán 4
Tính:
$\frac{3}{5}+\frac{6}{7}$ $\frac{1}{4}+\frac{5}{8}$ $\frac{2}{9}+\frac{5}{6}$
Bài Làm:
$\frac{3}{5}+\frac{6}{7}=\frac{21}{35}+\frac{30}{35}=\frac{51}{35}$
$\frac{1}{4}+\frac{5}{8}=\frac{2}{8}+\frac{5}{8}=\frac{7}{8}$
$\frac{2}{9}+\frac{5}{6}=\frac{4}{18}+\frac{15}{18}=\frac{19}{18}$