We are the same class.
A:on
B:in
C:at
Thanks ____ to your party.
定义在R上的函数fx满足f4=1,f'x为函数fx的导函数,已知f'x的图像如图所示,若两个正数a,b满足f2a+b<1,则b+1a+1的取值范围是( )