620、已知向量=→a(2,-1),→b=(0,1),则→a+2→b=()
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112、下列双曲线中,渐近线方程为y=±2x的是( )
A. 2 x2-y2-1
B. x2-y2/4=1
C. x2-y2/2=1
D. x2/4-y2=1
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195、在AABC中,AB=3AC=1B=,则A=()
A. π/6或π/3
B. 2π/3或π/3
C. π/6或π/2
D. π/2或π/3
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346、过点P(0,1)与圆(x-1)²+y²=4相交的所有直线中,被圆截得的弦最长的直线方程是( )
A. x=0
B. x-y+1=0
C. x+y-1=0
D. y=1
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353、直线吓唬成功x+ky=0,2x+3y+8=0和x-y-1=0交于一点,则k的值是( )
A. 1/2
B. -2
C. 2
D. -1/2
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431、若函数ef(x)(e=2.71828...是自然对数的底数)在f(x)的定义域上单调递增,则称函数f(x)具有M性质,下列函数中具有M性质的是()
A. f(x)=3
B. f(x)=2
C. f(x)=x²
D. f(x)=cos x
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177、若tana=lg(10a),tanβ=lga,且a-β= π+4,则实数a的
A. ()
B. 1或10
C. 1
D. 1或10/1
E. 10/1
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275、cosπ/8=sin π/8=()
A. √2/2
B. 1
C. -√2/2
D. 0
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175、
A. -3/1
B. 3/1
C. -/3
D. /3
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264、设a为锐角,若cos(a+π/6)=4/5 则sin(2a+π/3)的值为()
A. 12/23
B. -24/25
C. 24/25
D. 12/25
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