(根号4a^2-4a+1)+|a+2|
=√(2a-1)^2+|a+2|
=|2a-1|+|a+2|
1)若a<-2,则原式=-(2a-1)+(-a-2)=-2a+1-a-2=-3a-1
2)若-2≤a≤1/2,则原式=-(2a-1)+(a+2)=-2a+1+a+2=-a+3
3)若a>1/2,则原式=(2a-1)+(a+2)=2a-1+a+2=3a+1
(根号4a^2-4a+1)+|a+2|
=√(2a-1)^2+|a+2|
=|2a-1|+|a+2|
1)若a<-2,则原式=-(2a-1)+(-a-2)=-2a+1-a-2=-3a-1
2)若-2≤a≤1/2,则原式=-(2a-1)+(a+2)=-2a+1+a+2=-a+3
3)若a>1/2,则原式=(2a-1)+(a+2)=2a-1+a+2=3a+1