a, \(\dfrac{1212}{2323}=\dfrac{12.101}{23.101}=\dfrac{12}{23}\)
\(\Rightarrow\dfrac{1212}{2323}=\dfrac{12}{23}\)
b, \(\dfrac{414141}{676767}=\dfrac{41.10101}{67.10101}=\dfrac{41}{67}\\ \Rightarrow\dfrac{414141}{676767}=\dfrac{41}{67}\)
c, \(-\dfrac{5959}{4242}=\dfrac{59.\left(-101\right)}{42.101}=-\dfrac{59}{42}\)
\(\Rightarrow\dfrac{-5959}{4242}=-\dfrac{59}{42}\)