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anhhungbinhtan
2 năm trước
Tính nhanh,giải bằng phương trình lớp 5. a.1/2.3+1/3.4+1/4.5+1/5.6+...+1/18.19+1/19.20. b.1/7+1/91+1/247+1/475+1/775+1/1147. Giải giúp mik với.mik cảm ơn trước
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