设<img src="https://static.zxtiku.com/wangke/imgs/topic/bf704188550c3eeb0c0f00ec96e914cd.jpg"/>是以<img src="https://static.zxtiku.com/wangke/imgs/topic/cf4ecaa7a99ba67ef5ada06b1528af39.jpg"/>为顶点的三角形区域，<img src="https://static.zxtiku.com/wangke/imgs/topic/5ab33a9ff180a9aacca13f27c27f9ecf.jpg"/>是<img src="https://static.zxtiku.com/wangke/imgs/topic/bf704188550c3eeb0c0f00ec96e914cd.jpg"/>在第一象限部分，则<img src="https://static.zxtiku.com/wangke/imgs/topic/deb056d1940d3c9ae2c616d736626663.jpg"/><br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/01c2a5e8bd23eb6fe5400fa2c726a081.jpg"/><br/> B、0<br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/e6ae2713d8164fdfa0d63bc3af649c5e.jpg"/><br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/15a1bfb4a9bdce2b3e4f8cd90bb353c0.jpg"/>