A y=｜ƒ(x)｜ B y=-｜ƒ(x)｜ C y=xƒ(x) D y=ƒ(x)+ƒ(-x)<br/>

A <img width="110" height="31" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212532_7761.png" > B <img width="79" height="31" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212533_4479.png" > C <img width="58" height="31" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212534_9479.png" > D <img width="70" height="35" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212535_6199.png" ><br/>

A (1，-2) B (0，5) C (5，5) D (0，O)<br/>

A <img width="19" height="19" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212537_7917.png" > B <img width="19" height="19" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212539_2916.png" > C <img width="19" height="18" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212539_9411.png" > D <img width="30" height="18" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212541_4167.png" ><br/>

A {x｜-4<x<3} B {x｜-4≤x≤3} C {x｜-1<x<2) D {x｜-1≤x≤2}<br/>

A <img width="21" height="40" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212542_1041.png" > B πa³ C <img width="35" height="31" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212543_6198.png" > D <img width="21" height="39" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212544_2604.png" ><br/>

A 1 B 2 C 3 D 4<br/>