— .
A:That's for sure
B:Sounds good
C:It's relaxing
D:Come and show us
已知两个向量a→=(1+log2x,log2x),b→=(log2x,1)
(1)若a→⊥b→,求实数x的值;
(2)求函数f(x)=a→•b→,x∈14,2的值域.
经过点A(1,2),并且在两坐标轴上的截距的绝对值相等的直线共有( )