3) в) $$\frac{3}{4}$$ : 12 - $$\frac{1}{32}$$

$$\frac{3}{4}$$ : 12 = $$\frac{3}{4}$$ * $$\frac{1}{12}$$ = $$\frac{1}{4}$$ * $$\frac{1}{4}$$ = $$\frac{1}{16}$$ $$\frac{1}{16}$$ - $$\frac{1}{32}$$ = $$\frac{2}{32}$$ - $$\frac{1}{32}$$ = $$\frac{1}{32}$$ Ответ: $$\frac{1}{32}$$