đề là nt này pk???
\(x-2\sqrt{x}=0\)
\(\Leftrightarrow\sqrt{x}\left(\sqrt{x}-2\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}\sqrt{x}=0\\\sqrt{x}=2\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0\\x=4\end{cases}}}\)
tim cac gia tri cua x thuoc Q , biet : ( x+1)(x-2)< 0
tim cac gia tri cua x thuoc Q , biet : (x-2 ) : (3x+2) < 0
1) Tim a, b thuoc Q biet: a-b=2(a+b)=a:b
2) Tim x thuoc Q sao cho: (x-1)(x+3)<0
tim x thuoc q x-3/2<0
tim x, y,biet:x-y= 2(x+y)=x:y
Tim x thuoc Q
a,(x+1)(x-2)<0
tim so huu ti x biet:x^2=x^5
tim x biet:x/6=2/9
tim GTNN cua Q =\(\frac{27-2x}{12-x}\) voi x thuoc z
