$\left \{ {{(x+2)(y-3)=xy+100} \atop {(x-2)(y-2)=xy-68}} \right.$ ⇔$\left \{ {{xy-3x+2y-6=xy+100} \atop {xy-2x-2y+4=xy-68}} \right.$ ⇔$\left \{ {{-3x+2y=106} \atop {-2x-2y=-72}} \right.$ ⇔$\left \{ {{-3x+2y=106} \atop {-5x=34}} \right.$ ⇔$\left \{ {{y=214/5} \atop {x=-34/5}} \right.$
Chúc bạn học tốt nhé! ^^