bài 1 : Tim x a, $\frac{3}{4}$ x = $-\frac{5}{2}$ b, $\frac{1}{2}$x . $\frac{1}{4}$ = $\frac{-1}{2}$ x
2 câu trả lời
Đáp án:
$\text{a)$\dfrac{-10}{3}$ }$
$\text{b) x = 0}$
Giải thích các bước giải:
$\text{a)$\dfrac{3}{4}$. x= $\dfrac{-5}{2}$}$
$\text{x=$\dfrac{-5}{2}$ : $\dfrac{3}{4}$ = $\dfrac{-10}{3}$ }$
$\text{x= $\dfrac{-10}{3}$}$
$\text{$\frac{1}{2}$ x .$\frac{1}{4}$ =$\frac{-1}{2}$ x }$$\text{$\frac{1}{2}$ x .$\frac{1}{4}$ =$\frac{-1}{2}$ x }$
$\text{$\dfrac{1}{2}$ .$\dfrac{-1}{4}$x= $\dfrac{-1}{2}$ x}$}$
$\text{$\dfrac{x}{8}$=$\dfrac{-x}{2}$}$
$\text{x=-4x}$
$\text{$\Rightarrow$ x+4 x = 0}$
Vậy : $\text{x = 0}$
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