A:17a3b6
B:8a6b12
C:﹣a3b6
D:15a3b6
Don't fly a kite. I'm sorry.
已知函数f(x)=log2x,0<x<2cosπ2-π4x,2≤x≤10,若存在实数x1,x2,x3,x4满足x1<x2<x3<x4,且f(x1)=f(x2)=f(x3)=f(x4),则x1x2(x3﹣1)(x4﹣1)的取值范围是( )
直线l过圆(x﹣2)2+(y+2)2=25内一点M(2,2),则l被圆截得的弦长恰为整数的直线共有( )