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原式=1/二分之三/三分之四/四分之五/五分之六/六分之七/七分之八/八分之九/九分之十 =1*三分之二*四分之三*五分之四*六分之五*七分之六*八分之七*九分之八*十分之九 =1*十分之二(請按一個上邊和後一個下邊消了) =五分之一
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