tren bang cua mot lop hoc viet day so 1,2,3,...,1994 moi lan xoa di 2 so bat ki ta thay bang hieu cua chung , chung to rang du co lam nhu vay bao nhieu lan thi cung khong bao gio thu duoc ket qua con lai tren bang khong phai la so 0
cho day so 2;4;6;81012;......
a, hay tim chu so thu 100c day so tren
b, tim so hang thu 2021 cua day so
mn giup minh voi
cho day so 3,8,13,18,......
a, neu quy luat cua day so tren
b, viet tap hop a gom 5 so hang lien tiep cua day so tren
c, tinh tong 100 so hang dau tien cua day
d, so 158 la so hang thu bao nhieu cua day
cam mn nhieu love you
CHO DAY SO 1,--3,5,-7,9,-11,13,-15,17,-19
CO THE TIM DC 5 SO TREN DAY TREN CO TONG LA 15 KHONG
Viet lien tiep cac so tu nhien tu 1 den 60 thanh mot day, de duoc A =12345.....585960. hoi phai xoa di chu so nao de so con lai cua so A ( va giu nguyen thu tu ban dau cua cac chu so ) tao thanh so nho nhat ?
Cung hoi nhu tren trong truong hop so con lai cua A la so lon nhat ?
giai ho minh voi minh dang can gap vao toi nay
a)Co hay khong mot so K nguyen duong sao cho khi chia cho 1993 co cac chu so tan cung la 0001
Voi nuoc thu nhat chay vao mot mình day be trong 4h30p và voi thu hai chay mot minh day be trong 6h45p .Luc dau nguoi ta mo voi thu nhat. Chay trong mot thoi gian bang voi thoi gian hai voi cung chay day be,roi sau do mo voi thu hai . Hoi bao nhieu phut sau khi mo,voi thu,nhat thi day be?
viet cac so tu nhien lien tiep tu 1 den 100 tu trai sang phai thanh day :
a, day tren co bao nhieu chu so ?
b, chu so thu 1000 ke tu trai sang phai la nhung chu so nao ; la chu so cua so nao
cho day so
1,3,5,7,9....,79
a,day tren co bao nhieu so hang
b.day tren co bao nhieu so co hai chu so
c.de viet day tren can iet may chu so
d,so thu 25 cua day laso nao
Cho day so 2;5;10;17;....
a, Viet so hang tong quat cua day tren
b, Tim thu tu cua so 626 trong day so tren