cho day chu H,O,C,M,A,I ,H,O,C,M,A,I
a)hoi chu thu 80 cua day la chu gi?
b)khi viet den chu thu 65 thi ta duoc bao nhieu chu moi loai?
cho day chu H,O,C,M,A,I ,H,O,C,M,A,I
a)hoi chu thu 80 cua day la chu gi?
b)khi viet den chu thu 65 thi ta duoc bao nhieu chu moi loai?