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A.α⊥β,α∩β=l,m⊥l                     B.α∥β,α⊥γ,mγ

C.α⊥β,β⊥γ,m∥α                     D.n⊥α,n⊥β,m⊥α

A.x=            B.x=                C.x=π              D.x=

A.17              B.16                  C.15                 D.14

A.y=(x≥0)                 B.y=(x≤0)

C.y=-(x≥)                 D.y=-(x≤-)

A.3                B.16               C.15                D.4

(1)求曲線C的方程;

(2)若曲線C上存在一點(diǎn)D,使+=m,求m的值及點(diǎn)D到直線AB的距離.

(1)求函數(shù)f(x)的解析式;

(2)求函數(shù)f(x)的單調(diào)區(qū)間;

(3)若點(diǎn)P為函數(shù)f(x)=圖象上的任意一點(diǎn),直線l與函數(shù)f(x)=圖象相切于P點(diǎn),求直線l的傾斜角的取值范圍.

(1)求a₂,a₃的值;

(2)求數(shù)列{a_n}的通項(xiàng)公式與前n項(xiàng)和S_n.

(1)求這個(gè)口袋中原裝有紅球和黑球各幾個(gè);

(2)從原袋中任取3個(gè)球,記ξ為取出的3個(gè)球中紅球的個(gè)數(shù),求ξ的分布列和數(shù)學(xué)期望.