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ngocly7ahatinh
2 năm trước
Câu2:chọ câu trả lời đúng a, trung bình cộng của các số 19;22;30;31;38là: a27 b28 c29 D30 b trung bình cộng của các số 266; 296 ;305;435;518 là a365 b464 c455 d363
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