Cách làm cho bạn:
a. $\frac{x}{27}=\frac{-2}{3,6}$
<=> $x.3,6=(-2).27$
<=> $x=-54:3,6$
<=> $x=-15$
Vậy $x=-15$.
b. $-0,52:x=-9,36:16,38$
<=> $x=-0,52:(-9,36:16,3)$
<=> $x=0,91$
Vậy $x=0,91$.
c. $\frac{4\frac{1}{4}}{2\frac{7}{8}}=\frac{x}{1,61}$
<=> $\frac{\frac{17}{4}}{\frac{23}{8}}=\frac{x}{1,61}$
<=> $\frac{34}{23}=\frac{x}{1,61}$
<=> $23.x=34.1,61$
<=> $x=54,74:23$
<=> $x=2,38$
Vậy $x=2,38$.
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