Số? 1/4 + .../... = 3/4

a) $\frac{1}{4}$ + $\frac{...}{...}$ = $\frac{3}{4}$

b) $\frac{...}{...}$ - $\frac{3}{5}$ = $\frac{1}{5}$

a) $\frac{2}{3}$ - $\frac{...}{...}$ = $\frac{1}{3}$

a) $\frac{1}{4}$ + $\frac{1}{2}$ = $\frac{3}{4}$

b) $\frac{4}{5}$ - $\frac{3}{5}$ = $\frac{1}{5}$

a) $\frac{2}{3}$ - $\frac{1}{3}$ = $\frac{1}{3}$

a) $\frac{1}{4}$ + $\frac{...}{...}$ = $\frac{3}{4}$

$\frac{...}{...}$ = $\frac{3}{4}$ - $\frac{1}{4}$ = $\frac{2}{4}$= $\frac{1}{2}$

b) $\frac{...}{...}$ - $\frac{3}{5}$ = $\frac{1}{5}$

$\frac{...}{...}$ = $\frac{1}{5}$ + $\frac{3}{5}$ = $\frac{4}{5}$

a) $\frac{2}{3}$ - $\frac{...}{...}$ = $\frac{1}{3}$

$\frac{...}{...}$ = $\frac{2}{3}$ - $\frac{1}{3}$ = $\frac{1}{3}$