Đáp án:
$\frac{-15}{45}=\frac{12}{-36}$
$\frac{12}{24}=\frac{45}{90}$
$\frac{-21}{9}=\frac{-35}{15}$
Giải thích các bước giải:
$\frac{-15}{45}=\frac{-1}{3}\\
\frac{12}{24}=\frac{1}{2}\\
\frac{-21}{9}=\frac{-7}{3}\\
\frac{12}{-36}=\frac{-1}{3}\\
\frac{-49}{-21}=\frac{7}{3}\\
\frac{-60}{120}=\frac{-1}{2}\\
\frac{45}{90}=\frac{1}{2}\\
\frac{-35}{15}=\frac{-7}{3}$
Vậy $\frac{-15}{45}=\frac{12}{-36}$
$\frac{12}{24}=\frac{45}{90}$
$\frac{-21}{9}=\frac{-35}{15}$