Tính :
a , $\frac{3}{5}$ + $\frac{5}{7}$ =..................
$\frac{3}{4}$ + $\frac{5}{6}$ =......................
$\frac{3}{4}$ + 2$\frac{5}{7}$ =.....................
1$\frac{3}{4}$ + 7$\frac{5}{6}$ =....................
b , $\frac{19}{12}$ - $\frac{3}{4}$ =................
$\frac{19}{12}$ - $\frac{5}{6}$ =....................
1$\frac{11}{35}$ - $\frac{5}{7}$ =...................
7$\frac{19}{12}$ - 4$\frac{5}{6}$ =..................
Loga
Sinh Học lớp 12
