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a: =>5x-5+17x=1-12x-4
=>22x-5=-12x-3
=>34x=2
hay x=1/17
b: =>\(\left(x-3\right)^2-4x\left(x-3\right)=0\)
=>(x-3)(-3x-3)=0
=>x=3 hoặc x=-1
c: =>(x-4)(x-6)=0
=>x=4 hoặc x=6
a: =>17x-5x-15-2x-5=0
=>10x-20=0
=>x=2
b: =>\(\dfrac{3x-6-5x-10}{\left(x+2\right)\left(x-2\right)}=\dfrac{11x+23}{\left(x+2\right)\left(x-2\right)}\)
=>11x+23=-2x-16
=>13x=-39
=>x=-3(nhận)
c: =>5x+7>=3x-3
=>2x>=-10
=>x>=-5
d: =>5(3x-1)=-2(x+1)
=>15x-5=-2x-2
=>17x=3
=>x=3/17
e: =>4x^2-1-4x^2-3x-2=0
=>-3x-3=0
=>x=-1
g: =>7x-5-8x+2-7<0
=>-x-10<0
=>x+10>0
=>x>-10
a: =>17x-5x-15-2x-5=0
=>10x-20=0
=>x=2
b: =>\(\dfrac{3x-6-5x-10}{\left(x+2\right)\left(x-2\right)}=\dfrac{11x+23}{\left(x+2\right)\left(x-2\right)}\)
=>11x+23=-2x-16
=>13x=-39
=>x=-3(nhận)
c: =>5x+7>=3x-3
=>2x>=-10
=>x>=-5
d: =>5(3x-1)=-2(x+1)
=>15x-5=-2x-2
=>17x=3
=>x=3/17
e: =>4x^2-1-4x^2-3x-2=0
=>-3x-3=0
=>x=-1
g: =>7x-5-8x+2-7<0
=>-x-10<0
=>x+10>0
=>x>-10
a, 3x + 6x - 5 = 17x
9x - 5 = 17x
9x - 17x = 5
- 8x = 5
x = -5/8
b, 8(4x + 2 ) = 20x + 11x
32x + 16 = 31x
32x - 31x = -16
x = -16
c, \(\sqrt{x}^2\) - 2x + 1 = 0
\(\left(\sqrt{x}\right)^2\) - 2x + 1 = 0
\(\left(\sqrt{x}+1\right)^2\) = 0
\(\sqrt{x+1}\) = 0
x + 1 = 0
x = -1
a. (3x - 1)2 - (x + 3)2 = 0
\(\Leftrightarrow\left(3x-1+x+3\right)\left(3x-1-x-3\right)=0\)
\(\Leftrightarrow\left(4x+2\right)\left(2x-4\right)=0\)
\(\Leftrightarrow4x+2=0\) hoặc \(2x-4=0\)
1. \(4x+2=0\Leftrightarrow4x=-2\Leftrightarrow x=-\dfrac{1}{2}\)
2. \(2x-4=0\Leftrightarrow2x=4\Leftrightarrow x=2\)
S=\(\left\{-\dfrac{1}{2};2\right\}\)
b. \(x^3=\dfrac{x}{49}\)
\(\Leftrightarrow49x^3=x\)
\(\Leftrightarrow49x^3-x=0\)
\(\Leftrightarrow x\left(49x^2-1\right)=0\)
\(\Leftrightarrow x\left(7x+1\right)\left(7x-1\right)=0\)
\(\Leftrightarrow x=0\) hoặc \(7x+1=0\) hoặc \(7x-1=0\)
1. x=0
2. \(7x+1=0\Leftrightarrow7x=-1\Leftrightarrow x=-\dfrac{1}{7}\)
3. \(7x-1=0\Leftrightarrow7x=1\Leftrightarrow x=\dfrac{1}{7}\)
\(\text{a) }\left|\left|x+5\right|-4\right|=3\)
- Xét \(x\ge-5\Leftrightarrow\left|x+1\right|=3\):
+) Với \(x\ge-1\Leftrightarrow x+1=3\)
\(\Leftrightarrow x=2\left(T/m\right)\)
+) Với \(-5\le x< -1\Leftrightarrow-x-1=3\)
\(\Leftrightarrow x=-4\left(T/m\right)\)
- Xét \(x< -5\Leftrightarrow\left|x-9\right|=3\)
+) Với \(-5< x< 9\Leftrightarrow9-x=3\)
\(\Leftrightarrow x=6\left(T/m\right)\)
+) Với \(x\ge9\left(loại\right)\)
Vậy phương trình có tập nghiệm \(S=\left\{2;-4;6\right\}\)
\(\text{b) }\left|17x-5\right|-\left|17x+5\right|=0\\ \Leftrightarrow\left|17x-5\right|=\left|17x+5\right|\\ \Leftrightarrow\left[{}\begin{matrix}17x-5=\left(17x+5\right)\\17x-5=-\left(17x+5\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}17x-5=17x+5\\17x-5=-17x-5\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}17x-17x=5+5\\17x+17x=-5+5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}0x=10\left(loại\right)\\34x=0\end{matrix}\right.\Leftrightarrow x=0\)
Vậy phương trình có nghiệm \(x=0\)
\(\text{c) }\left|3x+4\right|=2\left|2x-9\right|\\ \Leftrightarrow\left[{}\begin{matrix}3x+4=2\left(2x-9\right)\\3x+4=-2\left(2x-9\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}3x+4=4x-18\\3x+4=-4x+18\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}3x-4x=-18-4\\3x+4x=18-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}-x=-22\\7x=14\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=22\\x=2\end{matrix}\right.\)
Vậy phương trình có tập nghiệm \(S=\left\{2;22\right\}\)