? 6×(1/2×1/2×1/2)-- what is wrong
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B,D,E是非常明显错的。A也错,因为AB〉AP+BQ (AF〉PF)。
-Betapro-
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08/20/2011 postreply
08:15:33
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now I got
-虚心学习1-
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08/20/2011 postreply
08:41:30