A:needn't; mustn't
B:can't; won't
C:mustn't; mustn't
D:may not; needn't
已知定义在R上的函数f(x)=-2x+a2x+1是奇函数.
(1)求实数a的值;
(2)已知不等式f(logm34)+f(﹣1)>0恒成立,求实数m的取值范围.
写出复数句。
Model: This is an old box.
These are old boxes.
This is a ruler.
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