1)
(1/4)^(x+ 1/2)-(1/2)^(x-2)+5 >5
(1/2)^(2x+ 1)-(1/2)^(x-2)+5 >5
所以呢, (1/2)^(2x+ 1)-(1/2)^(x-2)>0
所以呢,2x+10;
2x+1>0,x-2