急实数XY满足(x2+y2)2+(x2+y2)-6=0则x2+y2等于 A-3 B2 c2或-3 D3或-2
1个回答
把x2+y2当做一个整体,w.w>0
也就是w2+w-6=0
解得w=2
选B
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