如果函数f(x)=ax+b﹣1(a>0且a≠1)的图象经过第一、二、四象限,不经过第三象限,那么一定有( )
A:0<a<1且b>0
B:0<a<1且0<b<1
C:a>1且b<0
D:a>1且b>0
若函数f(x)=2sin(2x+π6)+a﹣1(a∈R)在区间0,π2上有两个零点x1,x2(x1≠x2),则x1+x2﹣a的取值范围是( )
某有机物X的化学式为C6H14O,能和钠反应放出氢气.X经酸性重铬酸钾(K2Cr2O7)溶液氧化最终生成Y(C6H12O2),若不考虑立体结构.X和Y在一定条件下生成酯最多有( )
Whenever Mary reads an interesting story, she can't keep it to and wants to share it with her friends.