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uyennhi
2 năm trước
Tất cả hs lớp 10a đều đăng ký ít nhat một trong ba môn: bóng đá, bóng chuyền, bóng rổ. Biết số lượng đăng ký môn bóng đá là 30 , bóng chuyền là 20, bóng rổ là 25. Cả bóng đá và bóng chuyền là 9, cả bóng đá và bóng rổ là 10, cả bóng chuyền và bóng rổ là 17 và số lượng đăng ký cả ba môn trên là 7 học sinh. Sĩ số lớp 10a là : A .75. B. 46. C. 45. D. 32
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