若直线l1:A1x+B1y+C1=0l2:A2x+B2y+C2=0则A1A2/B1B2=-1是l1垂直于l2的什么条件?充分不必要条件?必要不充分条件?充要条件?既不充分也不不要条件?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/18 01:57:31
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