Tìm x biết : |x-2|+|2x+3|+|5-x|=3x-2010
Tìm x biết:
|x-2|+|2x+3|+|5-x|=3x-2010
Bài 1: Tìm x, biết
a) 3/7x - 2/3x =10/21
b) 7/35 : ( x- 1/3)=2/25
c) | 2x-4 |+1=5
d) 3.| 3 - 2x | - 1=2/5
e) 3.(x-1/2)-5(x+3/5)=-x+1/5
f) (2x-1).(x+2/3)=0
g) x+4/2008+x+3/2009=x+2/2010+x+1/2011
a, \((\frac{3}{7}-\frac{2}{3})\) .x =\(\frac{10}{21}\)
\(\frac{-5}{21}\).x=\(\frac{10}{21}\)
x= -2
Mk chỉ làm 1 phần các phằn còn lại tương tự
Bài rút gọn biểu thức
a) M=|2x-3|+|x-1| với x > 1,5
b) N=|2-x|-3|x+1| với x < -1
c) P=|3x-5|+|x-2|
d) Q=|x-3|-2.|-5x|
a, \(\frac{3}{7}x-\frac{2}{3}x=\frac{10}{21}\Rightarrow\left(\frac{3}{7}-\frac{2}{3}\right)x=\frac{10}{21}\Rightarrow x=\frac{10}{21}.\left(\frac{-21}{5}\right)\Rightarrow x=-2\)
b, \(\frac{7}{35}:\left(x-\frac{1}{3}\right)=\frac{2}{25}\Rightarrow x-\frac{1}{3}=\frac{1}{5}:\frac{2}{25}\Rightarrow x=\frac{1}{10}-\frac{1}{3}=\frac{13}{30}\)
c, \(|2x-4|+1=5\)
\(\Rightarrow\orbr{\begin{cases}2x-4=4\\2x-4=-4\end{cases}}\Rightarrow\orbr{\begin{cases}x=4\\x=0\end{cases}}\)
d, \(3.|3-2x|-1=\frac{2}{5}\)
\(\Rightarrow3.|3-2x|=\frac{7}{5}\)
\(\Rightarrow\orbr{\begin{cases}3-2x=\frac{7}{15}\\3-2x=-\frac{7}{15}\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{19}{15}\\x=\frac{26}{15}\end{cases}}\)
f, \(\left(2x-1\right).\left(x+\frac{2}{3}\right)=0\)
\(\Rightarrow\hept{\begin{cases}2x-1=0\\x+\frac{2}{3}=0\end{cases}}\Rightarrow\hept{\begin{cases}x=\frac{1}{2}\\x=-\frac{2}{3}\end{cases}}\)
Tìm x biết:
a) x+2x+3x+4x+......+2011x=2012.2013
b)(x-1)/2011+(x-2)/2010-(x-3)/2009=(x-4)/2008
a) x+2x+3x+4x+...+2011x = 2012.2013
\(\Rightarrow\) x(1+2+3+4+...+2011) = 4050156
\(\Rightarrow\) x.2023066 = 4050156
\(\Rightarrow\) x = 4026/2011
Câu a ko nhất thiết phải tính ra số lớn như thế đâu
Tìm x biết:
a) |2x+3|=x+2
b) |3-x|=1-3x
c) |x-\(\frac{1}{5}\)|=\(\frac{1}{5}\)-x
d) (x-5)x+1=(x-5)x+11
e) 2010-|x-2010|=0
f) |3x-4|+|3x+5|=-9
a: |2x+3|=x+2
\(\Leftrightarrow\left\{{}\begin{matrix}x>=-2\\\left(2x+3+x+2\right)\left(2x+3-x-2\right)=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x>=-2\\\left(3x+5\right)\left(x+1\right)=0\end{matrix}\right.\)
hay x=-1
d: \(\left(x-5\right)^{x+11}=\left(x-5\right)^{x+1}\)
\(\Leftrightarrow\left(x-5\right)\left(x-4\right)\left(x-6\right)=0\)
hay \(x\in\left\{5;4;6\right\}\)
e: =>|x-2010|=2010
=>x-2010=2010 hoặc x-2010=-2010
=>x=4020 hoặc x=0
Tìm x biết:
a) 2x(3x+1) – (2x+3)(3x-2) = 12
b) (x+2)2 – (x-3)(x+3) = 5
b: \(\Leftrightarrow4x+13=5\)
hay x=-2
a) 2x(3x+1) – (2x+3)(3x-2) = 12
\(\Leftrightarrow6x^2+2x-\left(6x^2-4x+9x-6\right)=12\)
\(\Leftrightarrow6x^2+2x-6x^2+4x-9x+6=12\)
\(\Leftrightarrow-3x+6=12\)
\(\Leftrightarrow-3x=6\)
\(\Leftrightarrow x=-2\)
vậy x = -2
b) (x+2)2 – (x-3)(x+3) = 5
\(\Leftrightarrow\left(x+2\right)^2-\left(x^2-9\right)=5\)
\(\Leftrightarrow x^2+4x+4-x^2+9-5=0\)
\(\Leftrightarrow4x+8=0\)
\(\Leftrightarrow4x=-8\)
\(\Leftrightarrow x=-2\)
Vậy x = -2
Tìm x:
a . 12(x-5)=7x-5
b. 5+2!3x-1/2!=6
c. Tìm x thuộc Z
(2x-3)^2010=(2x-3)2012
Dấu ! là dấu giá trị tuyệt đối nha !
Ai nhanh mình tick
a) \(12\left(x-5\right)=7x-5\)
\(12x-60=7x-5\)
\(12x-7x=60-5\)
\(5x=55\)
\(x=11\)
a, 12(x-5)=7x-5
suy ra 12x-60-7x+5=0
suy ra 5x-55=0
suy ra x=55/5=11
vay x=11
b, ta có 5+2!3x-1/2!=6
suy ra 2!3x-1/2!=6-5=1
suy ra !3x-1/2!=1/2
xet th1: 3x-1/2=1/2
suy ra x=1/3
xet th2 3x-1/2=-1/2
suy ra x=0
vạy x=0 hoac x=1/3
c, (2x-3)^2010=(2x-3)^2012
xet th1 2x-3=1 suy ra x=2
xet th2 2x-*3=0 suy ra x=3/2
vạy x=2 hoac x=3/2
Tìm x biết
a, |2x+3| -3 |4-x|= -5
b, |x-2010| + |x-2012| + |x-2014| = 2
Tìm x biết:
a) 3(2x-1)(3x-3)-(2x-1)(3x-3)=-3
b) (3x-1)(2x+7)-(x+1)(6x-5)=x+2-(x+5)
BT1: cho -3x(x+5)=-3x2-15x
(x+3)(x+2)=x2+5x+6
Tìm x biết:
--3x(x+5)+(x+3)(x+2)=7
BT2:Cho(2x+1)2=4x2+4x+1
(2x+1)(2x-1)=4x2-1
Tìm x biết:
(2x+1)2-(2x+1)(2x-1)=19
BT3: Tìm x biết:
a)x(x+1)-x(x+5)=9
b)4x2(x+5)-8x(x+7)=13