A:I like riding a bicycle.
B:I like cars.
They are busy ____ (准备) for the picnic on Sunday.
青春期心里充满着矛盾,要处理好这些矛盾,应该在采取的方法是( )
已知函数y=ax(a>0且a≠1)在1,2上的最大值与最小值之和为20,记f(x)=axax+2.
(1)求a的值;
(2)求f(x)+f(1﹣x)的值;
(3)求f(1n)+f(2n)+…+f(n-1n)的值.