tìm x . biết : a) x - 0,5 =1/3+1/4
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a)\(\frac{1}{2}+\frac{3}{4}.x=\frac{1}{4}\)
\(\frac{3}{4}x=\frac{1}{4}-\frac{1}{2}\)
\(\frac{3}{4}.x=\frac{-1}{4}\)
\(x=\frac{-1}{4}:\frac{3}{4}\)
\(x=\frac{-1}{3}\)
Vậy \(x=\frac{-1}{3}\)
b)\(|x-5|-\frac{1}{3}=0,5\)
\(|x-5|=\frac{1}{2}+\frac{1}{3}\)
\(|x-5|=\frac{5}{6}\)
\(\Rightarrow\orbr{\begin{cases}x-5=\frac{5}{6}\\x-5=\frac{-5}{6}\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=\frac{5}{6}+5\\x=\frac{-5}{6}+5\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=\frac{35}{6}\\x=\frac{25}{6}\end{cases}}\)
Vậy\(x=\frac{35}{6}\)hoặc\(x=\frac{25}{6}\)
a/|x|-2,5=27,5
=>|x|=27,5+2,5=30
=>x=30 hoặc x=-30
b/\(\dfrac{3}{4}+\dfrac{2}{5}.x=\dfrac{29}{60}\)
=>\(\dfrac{2}{5}.x\)=\(\dfrac{29}{60}-\dfrac{3}{4}\)=\(\dfrac{-4}{15}\)
=>x=\(\dfrac{-4}{15}:\dfrac{2}{5}\)=\(\dfrac{-2}{3}\)
c/(x-1)\(^5\)=-32
=>x-1=-2 vì (-2)\(^5\)=-32
=>x=-2+1=-1
d/\(\dfrac{4}{5}.x+0,5=4.5\)
=>\(\dfrac{4}{5}.x+0,5=20\)
=>\(\dfrac{4}{5}.x=20-0,5=19,5\)
=>\(x=19,5:\dfrac{4}{5}\)=\(\dfrac{195}{8}\)
a) x-30%x=-4/5 b) (x-2).(x+4)=0 c)4/3-(0,5+2/3x)=1/6
1x-3/10x=-4/5 TH1: x-2 =0 =>x=2 4/3-(1/2+2/3x)=1/6
x(1-3/10)=-4/5 TH2: x+4 =0 =>x=-4 1/2+2/3x=4/3-1/6
x.7/10=-4/5 1/2+2/3x=7/6
x=-8/7 2/3x=7/6-1/2
2/3x=2/3
=>x=1
a. |x-1/5|=|-5/2|-|1/4-2/3|
=> |x-1/5|=5/2-5/12
=> |x-1/5|=25/12
+) x-1/5=25/12
=> x=137/60
+) x-1/5=-25/12
=> x=-113/60
Vậy x \(\in\){-113/60 ; 137/60}
b. (x-0,5).(x2-1,96)=0
+) x-0,5=0
=> x=0,5
+) x2-1,96=0
=> x2=1,96
=> x2=(7/5)2=(-7/5)2
=> x \(\in\left\{-\frac{7}{5};\frac{7}{5}\right\}\)
Vậy \(x\in\left\{-\frac{7}{5};0,5;\frac{7}{5}\right\}\).
c. 5/6 : x = 20 : 3
=> 5/6 : x = 20/3
=> x = 5/6 : 20/3
=> x=1/8
Vậy x=1/8.
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a) \(\frac{1}{2}x+\frac{3}{5}\left(x-2\right)=3\)
0,5 x + 0,6 ( x - 2 ) = 3
0,5 x + 0.6 x - 1,2 = 3
1,1 x = 4,2
x = \(\frac{42}{11}\)
Kết luận:
b) \(\frac{1}{3}x-0,5x=0,75\)
\(\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)
\(-\frac{1}{6}x=\frac{3}{4}\)
\(x=-\frac{9}{2}\)
Kết luận:
c) \(\frac{3}{-2}x-0,5x=75\%\)
-1,5x - 0,5x = 0,75
-2x = 0,75
x = -0,375
Kết luận:
d) \(-\frac{2}{5}x+\frac{1}{4}=75\%-\frac{3}{4}x\)
-0,4 x + 0,25 = 0,75 - 0,75 x
-0,4 x + 0,75 x = 0,75 - 0,25
0,35 x = 0,5
x = \(\frac{10}{7}\)
Kết luận:
\(a,\frac{1}{2}x+\frac{3}{5}\left(x-2\right)=3\)
\(\frac{1}{2}x+\frac{3}{5}x-\frac{6}{5}=3\)
\(\left(\frac{1}{2}+\frac{3}{5}\right)x-\frac{6}{5}=3\)
\(\frac{11}{10}x-\frac{6}{5}=3\)
\(\frac{11}{10}x=\frac{21}{5}\)
\(x=\frac{42}{11}\)
\(b,\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)
\(\left(\frac{1}{3}-\frac{1}{2}\right)x=\frac{3}{4}\)
\(\frac{-1}{6}x=\frac{3}{4}\)
\(x=\frac{-9}{2}\)
\(c,\frac{3}{-2}x-\frac{1}{2}x=75\%\)
\(\left(\frac{3}{-2}-\frac{1}{2}\right)x=\frac{3}{4}\)
\(-2x=\frac{3}{4}\)
\(x=\frac{-3}{8}\)
\(\frac{-2}{5}x+\frac{1}{4}=75\%-\frac{3}{4}x\)
\(\frac{-2}{5}x+\frac{3}{4}x=\frac{3}{4}-\frac{1}{4}\)
\(\left(\frac{-2}{5}+\frac{3}{4}\right)x=\frac{1}{2}\)
\(\frac{7}{20}x=\frac{1}{2}\)
\(x=\frac{10}{7}\)
\(x-0,5=\frac{1}{3}+\frac{1}{4}\)
\(x-\frac{1}{2}=\frac{7}{12}\)
\(x=\frac{7}{12}+\frac{1}{2}\)
\(x=\frac{13}{12}\)
a, \(x-\frac{1}{2}=\frac{7}{12}\)
\(x=\frac{7}{12}+\frac{1}{2}\) ( tự quy đồng )
\(x=\frac{13}{12}\)