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(原雞$8)-(賣$9)=-$1 (賺$1)
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" |2 e" |+ a( p! p4 L5.39.217.77(以$10)-(買回原雞$8)=$2 (蝕$2)5.39.217.77" H: t- p. U% O* n! y9 s

7 ^/ r1 K; a4 \4 O& @) ~($10雞)-(賣$11)=-$1 (賺$1)5 c- O' o+ _6 [6 ?5 c

8 d# K8 b$ `2 I: D6 i5.39.217.77總計=賺$1 蝕$2 賺$1
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試問賺2蚊再蝕2蚊...5.39.217.770 ]0 Y2 k7 ~3 a5 l% x

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