<span>1<x<2</span>
<span><span>3<y<4</span></span>
<span><span>3<xy<8</span></span>
<span><span>_________</span></span>
<span><span>9<3xy<24</span></span>
<span><span>-2<-x<-1</span></span>
<span><span>6<2y<8</span></span>
<span><span>________</span></span>
<span><span>4<2y-x<7</span></span>
<span><span>1/2<1/x<1</span></span>
<span><span>3<y<4</span></span>
<span><span>_________</span></span>
<span><span>3/2<y/x<4</span></span>