Mathematics, 30.07.2021 17:00 3steves

Một lớp học có 45 học sinh gồm ba loại: giỏi, khá, trung bình. Số học sinh giỏi chiếm 20% số học sinh cả lớp. Số học sinh còn lại bằng 9 2 số học sinh trung bình (số học sinh còn lại gồm hai loại: khá, trung bình). a) Tính số học sinh mỗi loại? b) Tính tỉ số phần trăm giữa số học sinh khá so với số học sinh cả lớp.

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Một lớp học có 45 học sinh gồm ba loại: giỏi, khá, trung bình. Số học sinh giỏi chiếm 20% số học sin...

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