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乘係數學運算一種,現代數學會以乘號表示。乘唔易以三言兩語概括,一般入門會以自然數介紹,相加多次數講解。乘數結果爲積。加、減、乘、除,合稱四則運算。
「」呢個數學符號係指連乘,源自希臘字母大楷Π(pi),即係將一列數冚唪唥乘埋一齊,例:
上述段意思係話「計 ,再將 至 之間嘅 乘埋一齊。」,其中下標寫咗約束變量()同埋佢嘅下界(1),上標就寫佢嘅上界(6)。上界同下界都一定係整數。
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