Question

tìm x thuộc Q:

a,(x-2)(x-1/2)<0

b,(1/3+x)(x+1)>0

c,x+3/x-2,5 > 0

d,x+0,5/3-x <0

Answer 1

mng giúp với

Answer 2

pls gấp quá

 

Answer 3

a:Ta có: \(\left(x-2\right)\left(x-\dfrac{1}{2}\right)< 0\)

\(\Leftrightarrow\left\{{}\begin{matrix}x-\dfrac{1}{2}>0\\x-2< 0\end{matrix}\right.\Leftrightarrow\dfrac{1}{2}< x< 2\)

b: Ta có: \(\left(x+\dfrac{1}{3}\right)\left(x+1\right)>0\)

\(\Leftrightarrow\left[{}\begin{matrix}x>-\dfrac{1}{3}\\x< -1\end{matrix}\right.\)