已知x2+4x+y2-2y+5=0,求x,y的值.
人气:337 ℃ 时间:2019-08-31 19:14:38
解答
x2+4x+y2-2y+5=0,
变形为:(x2+4x+4)+(y2-2y+1)=0,
即(x+2)2+(y-1)2=0,
又因(x+2)2与(y-1)2皆是非负数,
所以(x+2)2=0且(y-1)2=0,
即x+2=0,y-1=0,
解得x=-2,y=1;
答:x=-2,y=1.
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