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Anh Thu

3 tháng trước

Tìm x
A) X.1/2=3/4
B) 3/4.x+1/2=1/4

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chienbinhkieuhanh226

3 tháng trước

Đáp án:

Giải thích các bước giải:

$a) x . 1/2 = 3/4$

$⇒ x = 3/4 : 1/2$

$⇒ x = 3/4 . 2$

$⇒ x = 3/2$

Vậy $x = 3/2$

$b) 3/4 . x + 1/2 = 1/4$

$⇒ 3/4 . x = 1/4 - 1/2$

$⇒ 3/4 . x = -1/4$

$⇒ x = -1/4 : 3/4$

$⇒ x = -1/3$

Vậy $x = -1/3$

andybao2007

3 tháng trước

#andy

$\begin{array}{l} a)x.\dfrac{1}{2} = \dfrac{3}{4}\\ \Leftrightarrow x = \dfrac{3}{4}:\dfrac{1}{2}\\ \Leftrightarrow x = \dfrac{3}{4}.\dfrac{2}{1}\\ \Leftrightarrow x = \dfrac{3}{2}\\ b)\dfrac{3}{4}.x + \dfrac{1}{2} = \dfrac{1}{4}\\ \Leftrightarrow \dfrac{3}{4}x = \dfrac{1}{4} - \dfrac{1}{2}\\ \Leftrightarrow \dfrac{3}{4}x = - \dfrac{1}{4}\\ \Leftrightarrow x = - \dfrac{1}{4}:\dfrac{3}{4}\\ \Leftrightarrow x = - \dfrac{1}{4}.\dfrac{4}{3}\\ \Leftrightarrow x = - \dfrac{1}{3} \end{array}$

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