A:CH3CH2CH2CH3
B:CH3CH(CH3)2
C:CH3C(CH3)3
D:(CH3)2CHCH2CH3
对任意实数x,若不等式|x+1|﹣|x﹣2|>k在R上恒成立,则k的取值范围是( )
从方框中选出下列各旬的最佳应答语
A.I fell off the bike.
B.No,there weren't.
C.I went there by car.
D.I looked it up on the Internet.
E.Yes,I did.
下列各数中,哪些属于正数?哪些属于负数?哪些属于整数,哪些属于分数?哪些属于有理数?
5,﹣2,﹣0.3,34,-23,5.7,-116,101,﹣17,0.