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toanthangdang1090
2 năm trước
tính A=1/1.2.3+1/2.3.4+1/3.4.5+.....+1/18.19.20 cho mik hỏi là sao bài này lại lấy 2.A được mà bài B=36/1.3.5+36/3.5.7+36/5.7.9+......+36/19.21.23 lại ko thể nhân với 2.B đc ai giải thik chi tiết nhất phần này mik vote 5 sao ai giải thik chi tiết nhất mik vote 5 sao cảm ơn nhiều ạ giúp mik với
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