Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
( 1/8 + 13/4 -11/4 ) x-7 = (3/2 +0,65 + 7/200 ) :0,07
( 1/8 + 13/4 -11/4 ) x-7 = (3/2 + 0,65 + 7/200 ) : 0,07
0,625 x-7 = 437/14
0,625 x = 437/14 + 7
0,625 x = 525 /14
x = 525/14 : 0,625
x = 428/7
\(\Leftrightarrow\left(\dfrac{1}{8}+\dfrac{13}{4}-\dfrac{11}{4}\right)\cdot x=\left(\dfrac{3}{2}+\dfrac{65}{100}+\dfrac{7}{200}\right):\dfrac{7}{100}+7\)
\(\Leftrightarrow x\cdot\dfrac{5}{8}=\dfrac{535}{14}\)
=>x=428/7
\(\left(\frac{1}{4}x-1\right)+\left(\frac{5}{6}x-2\right)-\left(\frac{3}{8}x+5\right)=3,5\)
\(\Rightarrow\frac{1}{4}x-1+\frac{5}{6}x-2-\frac{3}{8}x-5=\frac{7}{2}\)
\(\Rightarrow\left(\frac{1}{4}+\frac{5}{6}-\frac{3}{8}\right)x+\left[\left(-1\right)+\left(-2\right)+\left(-5\right)\right]=\frac{7}{2}\)
\(\Rightarrow\frac{17}{24}x+\left(-8\right)=\frac{7}{2}\)
\(\Rightarrow\frac{17}{24}x=\frac{7}{2}-\left(-8\right)=\frac{23}{3}\)
\(\Rightarrow x=\frac{23}{2}:\frac{17}{24}=\frac{276}{17}\)
~ Hok tốt ~
Giải:
\(\left|-x+\dfrac{2}{5}\right|+\dfrac{1}{2}=3,5\)
\(\Leftrightarrow\left|-x+\dfrac{2}{5}\right|=3,5-\dfrac{1}{2}=3\)
Ta xét các trường hợp:
* Trường hợp 1:
\(-x+\dfrac{2}{5}=3\)
\(\Rightarrow-x=3-\dfrac{2}{5}=2,6\)
\(\Leftrightarrow x=-2,6\)
* Trường hợp 2:
\(-x+\dfrac{2}{5}=-3\)
\(\Rightarrow-x=-3-\dfrac{2}{5}=-3,4\)
\(\Leftrightarrow x=3,4\)
Vậy \(x\in\left\{-2,6;3,4\right\}\)
Chúc bạn học tốt!
$|-x+\dfrac{2}{5}|+\dfrac{1}{2}=3,5$
$=>|-x+0,4|+0,5=3,5$
$=>|-x+0,4|=3,5-0,5=3$
\(=>\left[{}\begin{matrix}-x+0,4=3\\-x+0,4=-3\end{matrix}\right.\)
\(=>\left[{}\begin{matrix}-x=3-0,4=2,6\\-x=-3-0,4=-3,4\end{matrix}\right.\)
\(=>\left[{}\begin{matrix}x=-2,6\\x=3,4\end{matrix}\right.\)
\(\left(x-2\right)^2+1=3,5:0,07\)
\(\Leftrightarrow\left(x-2\right)^2+1=50\)
\(\Leftrightarrow\left(x-2\right)^2+1=49\)
\(\Leftrightarrow\left[{}\begin{matrix}x-2=7\\x-2=-7\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=9\\x=-5\end{matrix}\right.\)