Biết là tìm x nhưng lần sau bạn lưu ý đăng đầy đủ đề nhé.
Lời giải:
$x^2-11|x|+10=0$
$\Leftrightarrow |x|^2-11|x|+10=0$
$\Leftrightarrow |x|^2-|x|-(10|x|-10)=0$
$\Leftrightarrow |x|(|x|-1)-10(|x|-1)=0$
$\Leftrightarrow (|x|-10)(|x|-1)=0$
$\Rightarrow |x|=10$ hoặc $|x|=1$
$\Rightarrow x=\pm 10$ hoặc $x=\pm 1$
Tìm x biết :
\(\left(x^2-20\right)\left(x^2-15\right)\left(x^2-10\right)\left(x^2-5\right)< 0\)
\(\left(x-10\right)^2-\left|10-x\right|=0\)
Tìm x
a) \(\left|x-\dfrac{1}{3}\right|+\dfrac{4}{5}=\left|\left(-3,2\right)+\dfrac{2}{5}\right|\)
b) \(\left(x-7\right)^{x+1}-\left(x-7\right)^{x+11}=0\)
Tìm x,y biết:
a)\(\left|x-\dfrac{4}{11}\right|+\left|5+y\right|=0\)
b)\(\left|\dfrac{1}{2}-\dfrac{1}{3}+x\right|=\dfrac{-1}{4}-\left|y\right|\)
c)\(\left|x-y\right|+\left|\dfrac{9}{25}+y\right|=0\)
TÌM x biết: \(\left(x-7\right)^{x+1}-\left(x-7\right)x+11=0\)
Tìm x, biết:
1) \(\left|4x\right|=3x+12\) 7) \(\left|5x\right|-3x-2=0\)
2) \(\left|2x+4\right|=2x-5\) 8) \(x-5x+\left|-2x\right|-3=0\)
3)\(\left|x+3\right|=3x-1\) 9) \(\left|3-x\right|+x^2-\left(4+x\right)x=0\)
4) \(\left|x-4\right|+3x=5\)
5)\(\left|x-5\right|=3x\)
6) \(\left|x+2\right|=2x-10\)
Tìm x biết: \(\left(x-7\right)^{x+1}-\left(x-7\right)^{x+11}=0\)
Tìm x biết: \(\left(x-7\right)^{x+1}-\left(x-7\right)^{x+11}=0\)
\(\frac{3}{\left(x+2\right)\left(x+5\right)}+\frac{5}{\left(x+5\right)\left(x+10\right)}+\frac{7}{\left(x+10\right)\left(x+17\right)}=\frac{x}{\left(x+2\right)\left(x+17\right)}\)voi x∈{-2;-5;-10;-17}
tìm x,y biết
a, \(\left(x-0,2\right)^{10}+\left(y+3,1\right)^{20}=0\)
b, \(\left(x^2-3^2\right)=16\)