即(a²-2a+1)+(4b²+4b+1)=0(a-1)²+(2b+1)²=0所以a-1=0,2b+1=0所以a=1。b=-1/2
a²+4b²-2a+4b+2=0(a²-2a+1)+(4b²+4b+1)=0(a-1)²+(2b+1)²=0(相加=0,所以前后应该为0)a-1=0,2b+1=0a=1。b=-1/2
(a-1)^2+(2b+1)^2=0a=1, b=-1/2