Question

giúp e với ạ

 

Answer 1

\(d,\left[{}\begin{matrix}\left\{{}\begin{matrix}x-2>0\\x+5< 0\end{matrix}\right.\\\left\{{}\begin{matrix}x-2< 0\\x+5>0\end{matrix}\right.\end{matrix}\right.=>\left[{}\begin{matrix}\left\{{}\begin{matrix}x>2\\x< -5\end{matrix}\right.\left(voli\right)}\\\left\{{}\begin{matrix}x< 2\\x>-5\end{matrix}\right.=>-5< x< 2}\end{matrix}\right.\)

Answer 2

d: =>x+5>0 và x-2<0

=>-5<x<2

e: =>(x-5)(x-7)<0

=>5<x<7

f: =>(3x+18)(7-x)<0

=>(x+6)(x-7)>0

=>x>7 hoặc x<-6