Question

已知集合A=y|y=(1/4)的x次方-3(1/2)的x+1次方,x属于(-1,2)B=x||x-m平方|≥1/4,

Answer 1

答：

y=(1/4)^x-3*(1/2)^(x+1)

=[(1/2)^x]^2-(3/2)*(1/2)^x

=[(1/2)^x-3/4]^2-9/16

因为：-1