May 2021 4 51 Report
一條中二數學平均數問題

已知中二甲班的男生和女生在一分鐘內完成掌上壓的平均次數分別為21和9,而全班學生的平均次數為13.4.若中二甲班有30名學生,分別求該班的男生和女生人數

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