1
a.=>x-2<0=>x<2
b.=>3x+6<0=>3x<-6=>x<-2
Chúc bạn học tốt ! ^_^
bài 1
a) Để 1/ x -2 âm
=> x - 2 < 0
<=> x < 2
b) Để - 5/ 3x + 6 dương
=> 3x + 6 < 0
<=> 3 ( x + 2 ) < 0
<=> x + 2 < 0
<=> x < -2
3/2x-4/3=-(1/2-2/3x)
<=> 3/2x-4/3=(-1/2)+2/3x
<=>3/2x-4/3-2/3x=-1/2
<=>x(3/2-2/3)-4/3=-1/2
<=>x.5/6-4/3=-1/2
<=>x.5/6=(-1/2)+4/3
<=>x.5/6=5/6
=>x=1
bài 2
\(\frac{3}{2}x-\frac{4}{3}=-\left(\frac{1}{2}-\frac{2}{3}x\right)\)
\(\Leftrightarrow\frac{3}{2}x-\frac{2}{3}x=-\frac{1}{2}+\frac{4}{3}\)
\(\Leftrightarrow\frac{5}{6}x=\frac{5}{6}\)
=> x =1