题目

直线的倾斜角__________ 答案：【答案】【解析】先求直线的斜率，进而得倾斜角的正切，从而得解.由直线的方程可得直线的斜率为4，则.所以倾斜角为.故答案为.17、For each question there are four c___, and you are asked to choose the best