Đáp án:
Giải thích các bước giải:
· $\frac{4}{7}$ + $\frac{3}{7}$ = $\frac{4 + 3}{7}$ = 1
· $\frac{3}{8}$ + $\frac{3}{4}$ = $\frac{3}{8}$ + $\frac{6}{8}$ = $\frac{3 + 6}{8}$ = $\frac{9}{8}$
· $\frac{1}{6}$ - $\frac{1}{12}$ = $\frac{2}{12}$ + $\frac{1}{12}$ = $\frac{2+1}{12}$ = $\frac{1}{4}$
· $\frac{13}{7}$ - $\frac{9}{5}$ = $\frac{13×5}{7×5}$ - $\frac{9×7}{5×7}$ = $\frac{65}{35}$ - $\frac{63}{35}$ = $\frac{2}{35}$
· $\frac{3}{4}$ × 12= $\frac{3}{4}$ × $\frac{12}{1}$ = $\frac{3×12}{4×1}$ = 9
- $\frac{3}{8}$ : 2= $\frac{3}{8}$ : $\frac{2}{1}$ = $\frac{3}{8}$ × $\frac{1}{2}$ = $\frac{3×1}{8×2}$ = $\frac{3}{16}$
`text{XIN HAY NHÂT}`
