Bạn tham khảo!
$a)$ $\dfrac{-0,25}{x}$ $=$ $\dfrac{1/3}{0,75}$
$→$ $\dfrac{-0,25}{x}$ $=$ $\dfrac{4}{9}$
$→$ $-0,25$ $.$ $9$ $=$ $x$ $.$ $4$
$→$ $-2,25$ $=$ $x$ $.$ $4$
$→$ $x$ $=$ $-0,5625$
$b)$ Mình đổi hỗn số ra luôn nhá!
$\dfrac{x}{19}$ $=$ $\dfrac{7}{36}$
$→$ $x$ $.$ $36$ $=$ $19$ $.$ $7$
$→$ $x$ $.$ $36$ $=$ $133$
$→$ $x$ $=$ $\dfrac{133}{6}$
$FbBinhne2k88$
