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一、选择题: 1.下列函数中,是偶函数且在(-∞,0]上是增函数的是( ) (A)y=x 2/3; (B)y=2~|x|; (C)y=-(x+1)~2; (D)y 2.复数z=-2(cosπ/4-isinπ/4)的辐角的主值是( ) (A)π/4;(B)3π/4;(c)4/5π;(D)7π/4。 3.a,b是异面直线,a⊥平面M,b⊥平面N,则平面M、N的关系是( ) (A)相交; (B)平行; (C)重合;(D)不能确定。 4.把y=cosx图象上所有点的横坐标缩小到原来的一半,纵坐标保持不变,然后把图象向左平移π/4个单位,得到的新函数图象,其解析式为( ) (A)y=cos(2x+π/4); (C)y=sin2x。 (B)y=cos(x/2+π/4); (D)y=-2sin2X。 5.已知1>0,且a≠1,函数y=a~x与y=log_a(-x)的图象只可能是( )
First, the multiple-choice questions: 1. The following function is an even function and is an increasing function on (-∞,0) is () (A)y=x 2/3; (B)y=2~|x| (C)y=-(x+1)~2; (D)y 2. The principal value of the argument of the complex z=-2(cosπ/4-isinπ/4) is () (A)π/4 (B)3π/4;(c)4/5π;(D)7π/4 3.a,b is a non-planar straight line, a⊥plane M, b⊥plane N, then the relationship between planes M, N is () (A) intersect, (B) parallel, (C) coincident, (D) not sure, 4. reduce the abscissa of all points on the y=cosx image to half original, the ordinate remains unchanged, and then The image is shifted to the left by π/4 units, and the new function image obtained has the analytical formula () (A)y=cos(2x+π/4); (C)y=sin2x. (B)y =cos(x/2+π/4); (D)y=-2sin2X 5. Image with known 1>0 and a≠1, functions y=a~x and y=log_a(-x) Only possible ()