設(shè)x2+y2=t(t≥0),則
t(t-1)-6=0,
整理得 (t-3)(t+2)=0,
解得 t1=3,t2=-2(不合題意,舍去),即x2+y2=3.
故選:C.
已知(x2+y2)(x2+y2-1)-6=0,則x2+y2的值是( ?。?A.3或-2 B.-3或2 C.3 D.-2
已知(x2+y2)(x2+y2-1)-6=0,則x2+y2的值是( ?。?br/>A. 3或-2
B. -3或2
C. 3
D. -2
B. -3或2
C. 3
D. -2
數(shù)學(xué)人氣:156 ℃時(shí)間:2020-06-14 11:53:02
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