So sánh các phân số
a)\(\dfrac{12}{14};\dfrac{1212}{1414};\dfrac{121212}{141414}\)
b)\(\dfrac{24}{35};\dfrac{2424}{3535};\dfrac{242424}{353535}\)
c)\(\dfrac{22}{25}\) và \(\dfrac{224466}{255075}\)
d)\(\dfrac{122436}{132639}\)và \(\dfrac{12}{13}\)
a)Ta có : \(\dfrac{1212}{1414}=\dfrac{12.101}{14.101}=\dfrac{12}{14}\)
\(\dfrac{121212}{242424}=\dfrac{12.10101}{24.10101}=\dfrac{12}{24}\)
Vậy \(\dfrac{12}{24}=\dfrac{1212}{2424}=\dfrac{121212}{242424}\)
Ta có : \(\dfrac{2424}{3535}=\dfrac{24.101}{35.101}=\dfrac{24}{35}\)
\(\dfrac{242424}{353535}=\dfrac{24.10101}{35.10101}=\dfrac{24}{35}\)
Vậy \(\dfrac{24}{35}=\dfrac{2424}{3535}=\dfrac{242424}{353535}\)