1. Tính : ( Hỗn số )
a, 1$\frac{4}{9}$ + 3$\frac{1}{7}$ = $\frac{13}{9}$ + $\frac{22}{7}$ = $\frac{289}{63}$
b, 12$\frac{4}{5}$ + 6$\frac{7}{10}$ = $\frac{64}{5}$ + $\frac{67}{10}$ = $\frac{195}{10}$
c, 4$\frac{5}{8}$ ×$\frac{3}{7}$ = $\frac{37}{8}$ × $\frac{24}{7}$ = $\frac{111}{7}$
d, 8$\frac{7}{7}$ ÷ 2$\frac{1}{8}$ = 9 ÷ $\frac{19}{8}$ = $\frac{72}{19}$
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