Đáp án:
$\dfrac{12}{-24}=\dfrac1{-2}$
$\dfrac{-39}{75}=\dfrac{-13}{25}$
$\dfrac{132}{-264}=\dfrac1{-2}$
Giải thích các bước giải:
$\dfrac{12}{-24}=\dfrac{12:12}{-24:12}=\dfrac1{-2}$
$\dfrac{-39}{75}=\dfrac{-39:3}{75:3}=\dfrac{-13}{25}$
$\dfrac{132}{-264}=\dfrac{132:132}{-264:132}=\dfrac1{-2}$