400-1816-180
本題由hyman1提供
1-30
If x + y = 2 and x2+y2=2 , what is the value of xy ?
（A） -2
（B） -1
（C） 0
（D） 1
（E） 2
（E） 2[OG18數(shù)學(xué)分冊-P][OG18數(shù)學(xué)分冊-P](A) -2
(B) -1
(C) 0
(D) 1
(E) 2(A) -2
(B) -1
(C) 0
(D) 1
(E) 2(A) -2
(B) -1
(C) 0
(D) 1
(E) 2(A) -2
(B) -1
(C) 0
(D) 1
(E) 2(A) -2
(B) -1
(C) 0
(D) 1
(E) 2
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答案：
D
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