a) $$\frac{20}{14}$$ = $$\frac{20 \div 2}{14 \div 2}$$ = $$\frac{10}{7}$$
в) $$\frac{18}{22}$$ = $$\frac{18 \div 2}{22 \div 2}$$ = $$\frac{9}{11}$$
Ответ: а) $$\frac{10}{7}$$, в) $$\frac{9}{11}$$