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一、选择题1 θ∈ ( 0 ,π2 ) ,直线ｘ +ｙｔａｎθ +1=0的倾斜角是 ( )(Ａ)θ (Ｂ) π2 -θ(Ｃ) π2 +θ (Ｄ)π -θ2 设点Ｐ(ａ ,3)在直线ｆ(ｘ ,ｙ) =0上的射影是θ( 1,ａ) ,则ｆ(ｘ ,ｙ)可以是 ( )(Ａ) 2ｘ - ｙ +3 (Ｂ)ｘ +2 ｙ - 3(Ｃ) 2ｘ - ｙ +7
First, the multiple choice question 1 θ∈ (0, π2), the inclination angle of the straight line x +ytanθ +1=0 is ()(A)θ (B) π2 -θ(C) π2 +θ (D)π -θ2 The projection of the point P(a, 3) on the straight line f(x, y) = 0 is θ( 1, a), then f(x, y) can be () (A) 2x - y +3 (B) x +2 y - 3(C) 2x - y +7