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直线l1:7x-y+4=0到l2:x+y-2=0的角平分线方程是( ) A.6x...
直线l1:7x-y+4=0到l2:x+y-2=0的角平分线方程是( )
A.6x+2y-3=0或x-3y+7=0
B.6x+2y+3=0
C.x+3y+7=0
D.6x+2y-3=0
考点分析:
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,则f(-12)+f(-11)+f(-10)+…+f(0)+…+f(11)+f(12)+f(13)的值为( )
A.
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B.
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C.
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D.
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平面α与球O相交于周长为2π的⊙O′,A、B为⊙O′上两点,若
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,且A、B两点间的球面距离为
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,则OO′的长度为( )
A.1
B.
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C.π
D.2
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向量
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,则向量
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的夹角的范围是( )
A.
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B.
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D.
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A.72
B.280
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C.1
D.不存在
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