—________?
—He is a teacher.
A:What does he look like?
B:How old is he?
C:What does he do?
D:Where is he?
计算:273+(x﹣2)0﹣15-1﹣2cos45°
We should do our part in _____our world beautiful.
若点x,y位于曲线y=2x与y=2所围成的封闭区域,则2x-y的最小值为( )
已知函数f(x)=e1+|x|﹣11+x2,则使得f(x)>f(2x﹣1)成立的x的取值范围是( )