Câu hỏi của Cao Thanh Trúc

Question

Giúp mk câu này với nhanh dùm : 4x-(x+$\dfrac{1}{2}$)=2x-($\dfrac{1}{2}$-5) trình bày ra nhé , cho mk thank you trước . Hihhihii...

Mashiro Shiina · Accepted Answer

Phá ngoặc ra là ok rồi mà:

$4x-\left(x+\dfrac{1}{2}\right)=2x-\left(\dfrac{1}{2}-5\right)$

$\Rightarrow4x-x-\dfrac{1}{2}=2x-\dfrac{1}{2}+5$

$\Rightarrow3x-\dfrac{1}{2}=2x+\dfrac{9}{2}$

$\Rightarrow3x-\dfrac{1}{2}-\dfrac{9}{2}=2x$

$\Rightarrow3x-5=2x$

$\Rightarrow x=5$Câu trả lời: Phá ngoặc ra là ok rồi mà:

$4x-\left(x+\dfrac{1}{2}\right)=2x-\left(\dfrac{1}{2}-5\right)$

$\Rightarrow4x-x-\dfrac{1}{2}=2x-\dfrac{1}{2}+5$

$\Rightarrow3x-\dfrac{1}{2}=2x+\dfrac{9}{2}$

$\Rightarrow3x-\dfrac{1}{2}-\dfrac{9}{2}=2x$

$\Rightarrow3x-5=2x$

$\Rightarrow x=5$

Không Quan Tâm · Answer

Ta :có

$4x-\left(x+\dfrac{1}{2}\right)=2x-\left(\dfrac{1}{2}-5\right)$

$\Leftrightarrow4x-2x=\left(\dfrac{1}{2}-5\right)+\left(x+\dfrac{1}{2}\right)$

$\Leftrightarrow2x=-4+x$

$\Leftrightarrow2x-x=-4$

$\Rightarrow x=-4$Câu trả lời: Ta :có

$4x-\left(x+\dfrac{1}{2}\right)=2x-\left(\dfrac{1}{2}-5\right)$

$\Leftrightarrow4x-2x=\left(\dfrac{1}{2}-5\right)+\left(x+\dfrac{1}{2}\right)$

$\Leftrightarrow2x=-4+x$

$\Leftrightarrow2x-x=-4$

$\Rightarrow x=-4$

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