A、<img src="https://img.ppkao.com/2015-10/liuziyi/2015102817271369724.jpg">
B、-<img src="https://img.ppkao.com/2015-10/liuziyi/2015102817271369724.jpg">
C、1/<img src="https://img.ppkao.com/2015-10/liuziyi/2015102817271369724.jpg">
D、-1/<img src="https://img.ppkao.com/2015-10/liuziyi/2015102817271369724.jpg">
查看答案