a) $$1\frac{5}{6} ? \frac{6}{11} = 1$$
$$1\frac{5}{6} = \frac{11}{6}$$
$$\frac{11}{6} \cdot \frac{6}{11} = 1$$
б) $$3 \frac{7}{4} ? 2 \frac{1}{4} = \frac{3}{4}$$
$$3 \frac{7}{4} - 2 \frac{1}{4} = \frac{3}{4}$$
в) $$\frac{5}{9} ? \frac{7}{9} = \frac{5}{7}$$
$$\frac{5}{9} : \frac{7}{9} = \frac{5}{9} \cdot \frac{9}{7} = \frac{5}{7}$$
г) $$\frac{5}{14} ? 0.7 = \frac{1}{4}$$
$$\frac{5}{14} - 0.7 = 0.357 - 0.7 = -0.343
eq \frac{1}{4}$$
$$\frac{5}{14} + 0.7 = 0.357 + 0.7 = 1.057
eq \frac{1}{4}$$
$$\frac{5}{14} \cdot 0.7 = 0.357 \cdot 0.7 = 0.25 \approx \frac{1}{4}$$
$$\frac{5}{14} : 0.7 = 0.357 : 0.7 = 0.51
eq \frac{1}{4}$$
a) $$1\frac{5}{6} \cdot \frac{6}{11} = 1$$
б) $$3 \frac{7}{4} - 2 \frac{1}{4} = \frac{3}{4}$$
в) $$\frac{5}{9} : \frac{7}{9} = \frac{5}{7}$$
г) $$\frac{5}{14} \cdot 0.7 = \frac{1}{4}$$
Ответ: a) умножить; б) минус; в) делить; г) умножить