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假設原本有$10, 用$8買雞, 剩$2
1 A& o' Q$ n! l公仔箱論壇之後$9賣出, $2+$9 = $11( v0 i0 N: ~! W/ I1 Z
再用$10買雞, $11-$10 = $1! h' U+ ]. ?' W% ~. Q1 f8 g* Z
又再以$11賣出, $1+$11 = $12
# E, n+ M6 i! p公仔箱論壇$12-$10 = 賺$2
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