在直角坐标系中,直线x+3y+1=0的倾斜角为( ) A.π4 B.2π3 C.3π4 发布时间:2017-04-17 09:16 │ 来源:www.tikuol.com 题型:选择题 问题: 在直角坐标系中,直线x+3y+1=0的倾斜角为( )A.π4B.2π3C.3π4D.5π6
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