2.12 若lg 5 = m ,则lg 2 = ( ) .
A. 5m
B. 1-m
C. 2m
D. m+1
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1.6 不等式x²-2x﹤0的解集为()
A. {x|x﹤0或x>2}
B. {x|-2<x﹤0}
C. {x|0<x<2}
D. {x|x<-2或x﹥0}
F.
G.
H.
I.
J.
解析:
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3.1 设集合M={1.2.3.4.5),N={2.4.6),则M∩N=()
A. {2,4}
B. {2,4,6}
C. {1,3,5}
D. {1,2,3,4,5,6}
F.
G.
H.
I.
J.
解析:
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3.21.从某篮球运动员全年参加的比赛中任选五场,他在这五场比赛中的得分分别为21,19,15,25,20,则这个样本的方差为____________.
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2.4.下列函数中,在区间(0, +
) 为增函数的是 ( ) .
A. y = x一1
B. y=x²
C. y=sinx
D. y=3-x
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2.1. 已知集合A = {2, 4, 8}, B = {2, 4, 6, 8} ,则A U B = ( ) .
A. {2, 4, 6, 8}
B. {2, 4}
C. {2, 4, 8}
D. {6}
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1.20等比数列中{an}若a2=8,公比为1/4则a5=__________.
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5.21.过点(1,-2 )且与直线3x+y-1=0垂直的直线方程为_________
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3.2.函数y = cos 4x 的最小正周期为 ( ) .
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4.1 设集合A = {0, 1}, B = {0, 1, 2}, 则A n B = ( ) .
A. {1,2}
B. {0,2}
C. {0,1}
D. {0,1,2}
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