x 次買到,每次增加2隻; y 次沒買到,每次減少1隻。總數增加2隻
2 x - y = 2
總共10次
x + y = 10
x 次買到,每次增加2隻; y 次沒買到,每次減少1隻。總數增加2隻
2 x - y = 2
總共10次
x + y = 10
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