单选题
(x+y) 2＜x2+y2Quantity A: xyQuantity B: 0
A、
Quantity A is greater.
B、
Quantity B is greater.
C、
The two quantities are equal.
D、
The relationship cannot be determined from the information given.
【正确答案】
B
【答案解析】
(x+y)=x2+y2+2xy，现在(x+y)2＜x2+y2，那么xy＜0，所以B为正确答案。
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