Mathematics, 26.07.2021 14:50 miastrick19

Đội tuyển thi học sinh giỏi của trường có 15 em trong đó có 9 em thi toán 6 em thi tiếng việt gặp ngẫu nhiên 2 em trong đội tuyển. tinh xác suất 2 em thi khác môn nhau

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Đội tuyển thi học sinh giỏi của trường có 15 em trong đó có 9 em thi toán 6 em thi tiếng việt gặp ng...

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