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【单选题】
已知 X 和 Y,用变形补码计算 X+Y 和 X-Y,并指出运算结果是否溢出: (1) X=0.11010,Y=0.11111
A.
[X+Y] 补：  溢出 [X－Y] 补 = 1.11100
B.
[X+Y] 补：  溢出 [X－Y] 补 = 1.11011
C.
[X+Y] 补 = 1.11100 [X－Y] 补 ： 溢出
D.
[X+Y] 补 = 1.11011 [X－Y] 补 ： 溢出
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