a) \(\dfrac{154}{374}=\dfrac{11x14}{11x34}=\dfrac{14}{34}\).
b) \(\dfrac{1717}{1818}=\dfrac{101x17}{101x18}=\dfrac{17}{18}\)
\(\dfrac{171717}{181818}=\dfrac{10101x17}{10101x18}=\dfrac{17}{18}\)
c) \(\dfrac{26+42}{64+82}=\dfrac{2x13+2x21}{2x32+2x41}=\dfrac{2x\left(13+21\right)}{2x\left(32+41\right)}=\dfrac{13+21}{32+41}\)