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(原雞$8)-(賣$9)=-$1 (賺$1) 公仔箱論壇+ d+ X" R5 |# C6 o1 ~
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(以$10)-(買回原雞$8)=$2 (蝕$2)6 F4 d+ d+ `0 x5 Y! c
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($10雞)-(賣$11)=-$1 (賺$1)
9 Y( M- L" U/ s3 Q# I/ U, O2 J$ V公仔箱論壇0 l; B0 K9 _$ ^, }9 N, \
總計=賺$1 蝕$2 賺$1
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7 t' P8 s# t! [' [8 H3 y" }7 G試問賺2蚊再蝕2蚊...
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答案=0