论文部分内容阅读
《2007—2008学年度第一学期海口市九年级数学科期终检测题》有这么一道题(选择题第9小题):在正方形网格中,△ABC的位置如图1所示,则cosB的值为().
There is such a question in the final test question of the 9th grade of Haikou city in the first semester of 2007-2008 school year (multiple choice question 9th question): In the square grid, the position of △ABC is shown in Figure 1. The cosB value is ().