Ta có:
|2x-5|+1=3x
=> |2x-5|=3x-1
=> 2x-5=3x-1 ; 2x-5=1-3x
=> -5+1=3x-2x ; 2x+3x=1+5
=>x=-4 ; 5x =6
; x=\(\dfrac{5}{6}\)
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Đại số lớp 7
Các câu hỏi tương tự
tim x biet \((x^2-20)\times\left(x^2-15\right)\left(x^2-10\right)\left(x^2-5\right)< 0\)
tim x biet \(\left|x-5\right|< =2\)
Bài 3.4: Tìm x, biết:
a) \(\left|2x-5\right|=x+1\)
b) \(\left|3x-2\right|-1=x\)
c) \(\left|3x-7\right|=2x+1\)
d) \(\left|2x-1\right|-1=x\)
Tìm giá trị nhỏ nhất của biểu thức :
a) A=\(\left|x+2\right|+\left|2x-3\right|+\left|x-5\right|\)
b) B=\(\left|x+2\right|+\left|3x-1\right|+\left|x-7\right|+5\)
c) C=\(\left|x+1\right|+4\left|2x-7\right|+\left|x-5\right|\)
d) D=\(\left|x+4\right|+5\left|x+1\right|+\left|x-2\right|+5\)
tìm x biết
a) \(\left|2x-7\right|=3\)
b) \(\left|21x-5\right|=\left|3x-7\right|\)
c) \(\left|7-2x\right|=1-3x\)
d) \(\left|x^2+3x\right|+\left|x^2+4x+3\right|=0\)
1.left|x+1right|+left|x+5right|+left|x+10right|4x
2.left|x-1right|+left|x-2right|5
3.left|x-3right|+left|x+1right|10
4.left|2x-1right|+left|3x-5right|+left|4-5xright|10-3x
Đọc tiếp
1.\(\left|x+1\right|\)+\(\left|x+5\right|\)+\(\left|x+10\right|\)=4x
2.\(\left|x-1\right|\)+\(\left|x-2\right|\)=5
3.\(\left|x-3\right|\)+\(\left|x+1\right|\)=10
4.\(\left|2x-1\right|\)+\(\left|3x-5\right|\)+\(\left|4-5x\right|\)=10-3x
Tim x biet :
\(a,\frac{x-1}{2009}+\frac{x-2}{2008}=\frac{x-3}{2007}+\frac{x-4}{2006}\)
\(b,\left|x-1\right|+\left|x-2\right|+\left|x-3\right|=4\left(x-4\right)\)
tim x , biet
x+ 2x+3x+ 4x+ ....+2014=2015.2016
Bài 1 : Tìm x biết :
a) \(3\left|x-1\right|+3\left|3x-5\right|=2\) b)\(\left|x+2\right|+\left|2x-1\right|+\left|5x-15\right|=10\)
Bài 2 :
a)\(\left|6x-9\right|+\left|9x-33\right|=13\) b)\(\left|x+1\right|+\left|3x-2\right|+\left|6x-24\right|=15\)