X x 1/2 - X x 1/4 =2/3 mình đang cần gấp giúp mình nhé
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X x 3 +X/2+X/4=\(1\frac{1}{2}\)
X(3+1/2+1/4)=3/2
X x 15/4=3/2
X =2/5
chúc bạn hok tốt!!!
X x 3 + X x \(\frac{1}{2}\)+ X x \(\frac{1}{4}\) = \(\frac{3}{2}\)
X x ( 3 + \(\frac{1}{2}\) + \(\frac{1}{4}\) ) = \(\frac{3}{2}\)
X x \(\frac{15}{4}\) = \(\frac{3}{2}\)
X = \(\frac{3}{2}\) : \(\frac{15}{4}\) = 0,4
X = 0,4
Học Tốt !!
(1+x)+(2+x)+(3+x)+(4+x)+(5+x)=10*5
(1+2+3+4+5)+ (x+x+x+x+x)=50
15+5*x=50
5*x=50-15
5*x=35
x=35:5=7
(1+x)+(2+x)+(3+x)+(4+x)+(5+x)=10*5
1+x+2+x+3+x+4+x+5+x=50
(1+2+3+4+5)+(x+x+x+x+x)=50
15+5x=50
5x=50-15
5x=35
x=35:5
x=7
\(\frac{x}{2}=\frac{3}{x-1}\)
\(\Rightarrow2\times3=x\times\left(x-1\right)\)
Vì \(x\times\left(x-1\right)\)là tích của 2 số tự nhiên liên tiếp
\(\Rightarrow x=3\)
x/2=3/x-1
x.(x-1)=2.3
vì x.(x-1) là tích của hai số nguyên liên tiếp
x=2 hoặc x=-2
nếu x thuộc số tự nhiên thì x=2 nha
1/2* x+2/3=9/2
1/2 * x = 9/2 - 2/3
1/2 * x= 23/6
x= 23/6 : 1/2
x= 23/6 x 2= 23/3
___
1/2*x-1/3=2/3
1/2*x = 2/3 + 1/3
1/2 * x= 1
x= 1: 1/2
x= 2
____
1/4+3/4:x=3
3/4 : x = 3 - 1/4
3/4 : x= 11/4
x= 11/4 : 3/4
x= 11/3
\(\dfrac{1}{2}\)\(\times\)\(x\) + \(\dfrac{2}{3}\) = \(\dfrac{9}{2}\)
\(\dfrac{1}{2}\)\(\times\)\(x\) = \(\dfrac{9}{2}\) - \(\dfrac{2}{3}\)
\(\dfrac{1}{2}\)\(\times\)\(x\) = \(\dfrac{23}{6}\)
\(x\) = \(\dfrac{23}{6}\):\(\dfrac{1}{2}\)
\(x\) = \(\dfrac{23}{3}\)
\(\dfrac{1}{2}\)\(\times\)\(x\) - \(\dfrac{1}{3}\) = \(\dfrac{2}{3}\)
\(\dfrac{1}{2}\)\(\times\)\(x\) = \(\dfrac{2}{3}\) + \(\dfrac{1}{3}\)
\(\dfrac{1}{2}\times\)\(x\) = 1
\(x\) = 1 : \(\dfrac{1}{2}\)
\(x\) = 2
\(\dfrac{1}{4}\) + \(\dfrac{3}{4}\): \(x\) = 3
\(\dfrac{3}{4}\): \(x\) = 3 - \(\dfrac{1}{4}\)
\(\dfrac{3}{4}\):\(x\) = \(\dfrac{11}{4}\)
\(x\) = \(\dfrac{3}{4}\): \(\dfrac{11}{4}\)
\(x\) = \(\dfrac{3}{11}\)
a. \(8x\left(x-2007\right)-2x+4034=0\)
\(\Rightarrow\left(x-2017\right)\left(4x-1\right)\)
\(\Rightarrow\left[{}\begin{matrix}x-2017=0\\4x-1=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=2017\\4x=1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2017\\x=\dfrac{1}{4}\end{matrix}\right.\)
Vậy x=2017 hoặc x=1/4
b.\(\dfrac{x}{2}+\dfrac{x^2}{8}=0\)
\(\Rightarrow\dfrac{x}{2}\left(1+\dfrac{x}{4}\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}\dfrac{x}{2}=0\\1+\dfrac{x}{4}=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\\dfrac{x}{4}=-1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-4\end{matrix}\right.\)
Vậy x=0 hoặc x=-4
c.\(4-x=2\left(x-4\right)^2\)
\(\Rightarrow\left(4-x\right)-2\left(x-4\right)^2=0\)
\(\Rightarrow\left(4-x\right)\left(2x-7\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}4-x=0\\2x-7=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=4\\x=\dfrac{7}{2}\end{matrix}\right.\)
Vậy x=4 hoặc x=7/2
d.\(\left(x^2+1\right)\left(x-2\right)+2x=4\)
\(\Rightarrow\left(x-2\right)\left(x^2+3\right)=0\)
Nxet: (x2+3)>0 với mọi x
=> x-2=0 <=>x=2
Vậy x=2
a, 8\(x\).(\(x-2007\)) - 2\(x\) + 4034 = 0
4\(x\)(\(x\) - 2007) - \(x\) + 2017 = 0
4\(x^2\) - 8028\(x\) - \(x\) + 2017 = 0
4\(x^2\) - 8029\(x\) + 2017 = 0
4(\(x^2\) - 2. \(\dfrac{8029}{8}\) \(x\) +( \(\dfrac{8029}{8}\))2) - (\(\dfrac{8029}{4}\))2 + 2017 = 0
4.(\(x\) + \(\dfrac{8029}{8}\))2 = (\(\dfrac{8029}{4}\))2 - 2017
\(\left[{}\begin{matrix}x=-\dfrac{8029}{8}+\dfrac{1}{2}.\sqrt{\left(\dfrac{8029}{4}\right)^2-2017}\\x=-\dfrac{8029}{8}-\dfrac{1}{2}.\sqrt{\left(\dfrac{8029}{4}\right)^2-2017}\end{matrix}\right.\)
\(3\dfrac{2}{5}\cdot1\dfrac{4}{7}=\dfrac{17}{5}\cdot\dfrac{11}{7}=\dfrac{187}{35}\)
X*(1/2-1/4)=2/3
X*1/4=2/3
X=2/3:1/4
X=8/3
X x \(\frac{1}{2}\)- X x \(\frac{1}{4}\)= \(\frac{2}{3}\)
X x (\(\frac{1}{2}\)- \(\frac{1}{4}\)) = \(\frac{2}{3}\)
X x \(\frac{1}{4}\)= \(\frac{2}{3}\)
X = \(\frac{2}{3}\) : \(\frac{1}{4}\)
X = \(\frac{8}{3}\)