⑴.函数y＝χ2 +bχ+c∈［0, +∞)是单调函数的充要条件是 A.b≥0 B.b≤0 C.b＜0 D.b＞0 ⑵.设函数f (χ) ＝ ,若f (χ0) ＞1.则χ0的取值范围——青夏教育精英家教网—

⑴.函数y＝χ2 +bχ+c∈［0, +∞)是单调函数的充要条件是 A.b≥0 B.b≤0 C.b＜0 D.b＞0 ⑵.设函数f (χ) ＝ ,若f (χ0) ＞1.则χ0的取值范围是······················································· A. B. C. D. ⑶.已知f (χ5) ＝logχ.则等于f (2) ························· A.lg2 B.lg32 C.lg D.lg2 ⑷.设a＝40.9, b＝80.48.c＝( )-1. 5.则····················· A.c＞a＞b B.b＞a＞c C.a＞b＞c D.a＞c＞b ⑸.函数y＝2-χ+1的反函数是······················ A.lg 2.χ∈(1.2) B.-lg 2.χ∈(1.2) C.lg 2.χ∈(1.2］ D.-lg 2.χ∈(1.2］ ⑹.已知函数y＝aχ在[0.1]上的最大值与最值之和为4.则a的值 ······················································· A.3 B.4 C.2 D. ⑺.若集合M={ y | y=2-χ}.P={ y | y= }.χ≥1则MP= A. { y | y ＞1} B.{ y | y ≥1} C. { y | y ＞0} D.{ y | y ≥0} ⑻.y＝log 0.3的定义域是······························ A. C. ⑼.函数y＝的值域是································· A.[ 0, +∞) B. D.( 0, 1 ] ⑽.y＝()的单调增区间是 ························ A.[-1.] B. D.[.2] ⑾.y＝log (-χ2-2χ+3)的递减区间是 ··············· A. C. ⑿.当a＞1时.函数y＝log aχ与y＝(1-a)χ的图象只可能是 A. B. C. D. 【查看更多】

题目列表(包括答案和解析)

下列四个图形中，能表示函数y＝2^|x|的大致图象的序号是________．