1.若a²+4b²-2a+4b+2=0,求a、b的值 2.已知x、y满足x²+y²+17\4=4x+y 求代数式xy\x+y
问题描述:
1.若a²+4b²-2a+4b+2=0,求a、b的值 2.已知x、y满足x²+y²+17\4=4x+y 求代数式xy\x+y
答
1. a²-2a+1+4b²+4b+1=0
(a-1)²+(2b+1)²=0
a-1=0且2b+1=0
a=1,b=-1/2
2. x²-4x+4+y²-y+1/4=0
(x-2)²+(y-1/2)²=0
x=2,y=1/2