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【单选题】
若方程2x 2 =1的两实数根为x 1 、 x 2 ，则（ ）A.
x 1 +x 2 =0且x 1 x 2 =1
B.
x 1 +x 2 =1且x 1 x 2 =0
C.
x 1 +x 2 =0且x 1 x 2 =- 1 2
D.
x 1 +x 2 =0且x 1 x 2 = 1 2
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