A <img src="https://www.beizhujiaoyu.com/uploads/202208/164717513878241.png" width="121" height="103" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/164717514286031.png" width="118" height="104" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/164717514784221.png" width="122" height="102" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/164717515367751.png" width="118" height="102" />

A a=-2，b=-2 B a=-2，b=2 C a=2，b=-2 D a=2，b=2

A x=-2，y=0 B x=0，y=-2 C x=2，y=0 D x=0，y=2

A <img src="https://www.beizhujiaoyu.com/uploads/202208/164717516641251.png" width="126" height="101" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/164717517042031.png" width="108" height="101" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/164717517551471.png" width="91" height="101" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/164717518036651.png" width="74" height="101" />