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可答案是（-无穷，-3/2]∪[-√3/4,√3/4]∪[3/2,+无穷）。。。题目中|x-m平方|=|x-m²|还是：|x-m平方|=|(x-m)²|？如果是后者：|(x-m)²|>=1/4(x-m)²>=1/4x-m>=1/2或者x-m<=-1/2x>=m+1/2或者x<=m-1/2A可以推出B，所以：x>=-9/16>=m+1/2，m<=-17/16x<=m-1/2<1，m<3/2是前者啊答案有错误....