(本小题满分14分) 已知函数 . (1)解关于x的不等式f(x)<0; (2)当c=-2时,不等式f(x)>ax-5在上恒成立,求实数a的取值范围; (3)设,已知,,求的范围. 答案:(本小题满分14分) 解:(1) ……1分 ①当c<1时, ②当c=1时,, ③当c>1时, ……3分 综上,当c<1时,不等式的解集为,当c=1时,不等式的解集为,当c>1时,13、--- Would you like the presents in plain colors or
with printed patterns?
---________
--- It all depends on personal
taste.
A.I will buy a scarf.
B.I couldn’t really say which
is better.
C.I don’t know really.Would you show me some of each?
D.What does it depend on?