Rút gọn:
$\dfrac{15}{35}=\dfrac{3}{7}$
$\dfrac{-6}{33}=\dfrac{-2}{11}$
$\dfrac{21}{49}=\dfrac{3}{7}$
$\dfrac{-21}{91}=\dfrac{-3}{13}$
$\dfrac{14}{-77}=\dfrac{-2}{11}$
$\dfrac{-24}{104}=\dfrac{-3}{13}$
$\dfrac{6}{22}=\dfrac{3}{11}$
$⇒\dfrac{15}{35}=\dfrac{21}{49}=\dfrac{3}{7}$
$\dfrac{-6}{33}=\dfrac{14}{-77}=\dfrac{-2}{11}$
$\dfrac{-21}{91}=\dfrac{-24}{104}=\dfrac{-3}{13}$
$⇒$ $\text{Phân số không bằng với các số còn lại là}$ $\dfrac{6}{22}$.
