ban Dung gop:1-(1/3+1/4)=5/12(tong so tien)
So tien mua may tinh bo tui la:15600:5/12=37440d
D/s 37400d
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bon ban gop tien mua chung mot chiec may tinh bo tui. ban An gop 1/2 tong so tien cua ba ban khac.ban Bình góp 1/3 tong so tien cua 3 ban khac.ban Cuong gop 1/4 tong so tien cua ba ban khac.con ban Dung gop 15600đ.hoi gia tien cua chiec may tinh bo tui va so tien cua moi nguoi
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bai 1
cho tong : S = 5 + 8 + 11 +14 = ....
a) tim so hang thu 100 cua tong
b) tinh tong 100 so hang dau tien
bai 2
cho tong : S = 7 + 12 + 17 + 22 + .......
a) tim so hang thu 50 cua tong
b) tinh tong 50 so hang dau tien
bai 3
tinh tong cua tat ca cac so hang tu nhien x , biet x la so tu nhien co 2 chu so va 12 < x <91
ban nao lam ho minh 3 bai tren voi ma ban nao nao lam ra dau tien minh se tich ngay va lun
an va binh di mua vo . an mua het 5/9 so tien mang di thi so tien con lai cua 2 ban = nhau tim so tien mua vo cua biet an co so tien it hon binh binh 15000 dong
jup minh le le nha a hi hi
no dang tong ti