Đề??.

1)

a)|17x-5|-|17x+5|=0

   17x-5=0 hoặc 17x+5=0

    17x=0+5       17x=0-5

     17x=5          17x=-5

      x=5:17        x=-5:17

      x=5/17         x=-5/17

a: =>|7x-9|=5x-3

\(\Leftrightarrow\left\{{}\begin{matrix}x>=\dfrac{3}{5}\\\left(7x-9-5x+3\right)\left(7x-9+5x-3\right)=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x>=\dfrac{3}{5}\\\left(2x-6\right)\left(12x-12\right)=0\end{matrix}\right.\Leftrightarrow x\in\left\{1;3\right\}\)

b: \(\Leftrightarrow\left|4x+1\right|=8x-x-2=7x-2\)

\(\Leftrightarrow\left\{{}\begin{matrix}x>=\dfrac{2}{7}\\\left(7x-2-4x-1\right)\left(7x-2+4x+1\right)=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x>=\dfrac{2}{7}\\\left(3x-3\right)\left(11x-1\right)=0\end{matrix}\right.\Leftrightarrow x=1\)

c: |17x-5|=|17x+5|

=>17x-5=17x+5 hoặc 17x+5=5-17x

=>x=0

a: =>|7x-9|=5x-3

\(\Leftrightarrow\left\{{}\begin{matrix}x>=\dfrac{3}{5}\\\left(7x-9-5x+3\right)\left(7x-9+5x-3\right)=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x>=\dfrac{3}{5}\\\left(2x-6\right)\left(12x-12\right)=0\end{matrix}\right.\Leftrightarrow x\in\left\{3;1\right\}\)

b: =>|17x-5|=|17x+5|

=>17x-5=17x+5(vô lý) hoặc 17x-5=-17x-5

=>34x=0

hay x=0

c: =>|3x+4|=|4x-18|

=>4x-18=3x+4 hoặc 4x-18=-3x-4

=>x=22 hoặc 7x=14

=>x=22 hoặc x=2

mình cũng đang bí bài này ai giúp với

1.\(\left|9-7x\right|=5x-3\)

\(\Leftrightarrow\orbr{\begin{cases}9-7x=5x-3\\9-7x=-5x-3\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}-7x-5x=-9-3\\-7x+5x=-9-3\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}-12x=-12\\-2x=-12\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=-12:\left(-12\right)\\x=-12:\left(-2\right)\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=1\\x=6\end{cases}}\)

2.\(8x-\left|4x+1\right|=x+2\)

\(\Rightarrow\left|4x+1\right|=8x-x+2\)

\(\Rightarrow\left|4x+1\right|=7x+2\)

\(\Leftrightarrow\orbr{\begin{cases}4x+1=7x+2\\4x+1=-7x+2\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}4x-7x=2-1\\4x+7x=2-1\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}-3x=1\\11x=1\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=1:\left(-3\right)\\x=1:11\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=\frac{-1}{3}\\x=\frac{1}{11}\end{cases}}\)

chào các bạn,có 2 tốt bụng thì tk mik nhé,cần lắm những người như thế

a) |9-7x| = 5x-3

*  9-7x=5x-3    <=>x=1

*  9-7x=-(5x-3) <=> x=3

thanks bn nhìu

a: \(=2x^2-4x-6x+12-2x^2+10x=12\)