a) $$\frac{55}{99}$$ = $$\frac{5 \times 11}{9 \times 11}$$ = $$\frac{5}{9}$$
г) $$\frac{120}{125}$$ = $$\frac{24 \times 5}{25 \times 5}$$ = $$\frac{24}{25}$$
Ответ: а) $$\frac{5}{9}$$, г) $$\frac{24}{25}$$