hay viet xen vao cac chu so cua so 12 345 mot dau + de duoc tong = 60

bai 1:

1 hay viet lien tiep 20 chu

so 5 thanh hang ngang roi dat dau cong vao giua cacso do de tong la 1000

2. viet lien tiep 8 chu so 8 thanh hang ngang dat dau cong vao giua cac so do de tong la 1000

bai 2:

chia cac

so tu nhien tu 1 den 100 thanh 2 lop : lop chan va lop le. hoi lop nao co tong cac chu so lon hon va lon hon bao nhieu

1.Cho so N la so co hai chu so chia het cho 3.Neu viet xen so 0 vao giua hai chu so do roi cong no voi hai lan chu so hang chuc cua so N ta duoc so moi gap 9 lan so N.Tim so do

2.Tong hai so thap phan la 60,1.Neu dich dau phay cua so nho sang ben phai mot hang roi dem tru di so lon thi ta duoc 219,52.Tim hai so do.

3.Tim so co hai chu so biet neu ta them so 33 vao giua hai chu so do thi duoc mot so moi gap so phai tim 89 lan.

neu xen vao giua cac chu so cua 1 so co 2 chu so kem so do 1 don vi thi se duoc 1so co 4 chu solon gap 9 lan chu so ban dau

trung binh cog cua 3 so la 57,5.so thu ba kem tong 2 so dau la 47,5.neu viet them chu so 0 vao ben phai so thu 1 ta dc so thu 2.tim 3 so do.ai giai duoc minh like manh

tu ba so doi 1 khac nhau va khac 0 ta lap dc tat ca cac so co 3 Chu so doi 1 khac nhau . Biet rang tong cac so lap dc la 2886 , hieu giua so lon nhat va so be nhat trong cac so lap dc la 495 . Cac chu so do la : .....;......;........(viet cac chu so theo gia tri tang dan )

GIUP MIH NHA MIH GAP LAM

cho so 97531 .Viet them chu so 8 xen giua cac chu so cua so do de duoc so

a. lon nhat

b . bé nhất

neu ta viet them chu so 0 vao giua cac chu so cua mot so co 2 chu so ta duoc mot so moi co 3 chu so lon hon so dau tien 7 lan. tim so do

cho so 8642.Viet thêm chữ số 0 xen giua cac chu so cua so da cho de duoc so nho nhat co the. Số đó là.....?