\(|x-1|=2x\)
<=>\(\left[{}\begin{matrix}x-1=2x\\x-1=-2x\end{matrix}\right.\)
<=> \(\left[{}\begin{matrix}x=-1\\x=\dfrac{1}{3}\end{matrix}\right.\)
Tìm \(x\in Q\)
a)\(\left|x-\frac{1}{5}\right|+\left|2x-0,4\right|=0\) b)\(\left|x+\frac{1}{4}\right|+\left|2x+0,5\right|\le0\)
Tìm x ;
\(\left(\frac{1}{2}x^2\left(2x-1\right)^m-\frac{1}{2}x^{m+2}\right):\frac{1}{2}x^2=0\left(m\in N\right)\)
b)\(\left(1,78^{2x-2}-1,78^x\right):1,78^x=0\)
Tìm x
a) \(\left|x+\frac{1}{5}\right|+\left|x^2-\frac{1}{25}\right|=0\)
b) \(\left|2x-y\right|+\left|y-2x\right|=0\)
( \(x,y\in N\) )
Tìm x, y \(\in\)Z:
a. \(2x-\frac{6}{y}=1\)
b. \(\left(x^2+1\right).\left(x^2-3\right).\left(x^2-9\right)< 0\)
Tìm \(x\in Q\), biết:
\(\left|x-3\right|+\left|3x+4\right|-\left|2x+1\right|=0\)
Tìm \(x\in Q\), biết:
\(\left(2x-1\right)^6=\left(2x-1\right)^8\)
tìm x\(\in\) Q
a) \(\left(2x-1\right)^3=-27\)
b) \(\left(2x-1\right)^6=\left(2x-1\right)^8\)
1.tìm x, y \(\in\)N
\(25-y^2=8\left(x-2009\right)^2\)
2.tìm x, y thõa mãn:
\(_{^{\left|2x-27\right|^{2007}+\left(3y+10\right)^{2008}=0}}\)
Bài 1: Tìm \(n\in Z\) đẻ phân số sau là phân số tối giản: \(\frac{3n+2}{7n+1}\)
Bài 2: Tìm \(x,y\in Z\) biết:
a. \(\left(x+2\right)\left(y-3\right)=5\)
b. \(\left(x+1\right)\left(xy-1\right)=3\)
c. \(-12\left(x-5\right)+7\left(3-x\right)=5\)
d. \(30\left(x+2\right)-6\left(x-5\right)-24x=100\)
e. \(\left(2x+1\right)\left(3y-2\right)=-55\)
g. \(xy+3x-7y=21\)
k. \(xy+12=x+y\)
h. \(xy-2x-3y+1=0\)
