712 : 흡++=

7) $$2 \frac{1}{16} : \frac{3}{4} + \frac{1}{4} =$$ 1) $$2 \frac{1}{16} = \frac{2 \cdot 16 + 1}{16} = \frac{32+1}{16} = \frac{33}{16}$$

2) $$\frac{33}{16} : \frac{3}{4} = \frac{33}{16} \cdot \frac{4}{3} = \frac{33 \cdot 4}{16 \cdot 3} = \frac{11 \cdot 3 \cdot 4}{4 \cdot 4 \cdot 3} = \frac{11}{4}$$

3) $$\frac{11}{4} + \frac{1}{4} = \frac{11+1}{4} = \frac{12}{4} = 3$$

Ответ: 3