Tich 0.1x0.01x.........x0.00000...000001. tich co bao nhieu chu so 1,bao nhieu chu so 0 sau dau phay biet thua so cuoi cung co 98 chu so 0 sau dau phay

cho tich sau:

0,9 x 1,9 x 2,9 x 3,9 x . . . x  18,9

a) Khong viet ca day,cho biet tich nay co bao nhieu thua so?

b) Tich nay tan cung bang chu so nao?

c) Tich nay co bao nhieu chu so phan thap phan?

A= 0.10*0.01 * 0.001* 0.0001* 0.00001 * ....*0.00.....01 co bao nhieu chu so 0 nam sau dau phay biet thua so cuoi cung co 20 chu so 0 o phan thap phan

cac so thap phân co phan nguyen bang nhau, phan thap phan moi so co mot chu so khac 0 va khac nhau. hoi tich cua tat ca  cac so do co phan thap gom bao nhieu chu so

Khi nhan 1 so thap phan co 2 chu so o phan thap phan voi 12,35 mot ban da dat cac tich rieng nhu doi voi phep cong va co ket qua la 220,66 . Hay tim ket qua dung cua phep nhan do . biet rang dau phay o cac thua so thang cot voi nhau

Hay cho biet co bao nhieu so thap phan co 2 chu so o phan thap phan duoc viet boi cac chu so 0. 3. 5.8ma co du mat 4 chu so do

1..Voi cac chu so 0;1;2;8.Hoi lap duoc bao nhieu so thap phan co du 4 chu so da cho ma co 2 chu so o phan nguyen

2..Voi cac chu so 2;8;1;5.Hoi lap duoc bao nhieu so thap phan co du 4 chu so da cho ma co 2 chu so o phan nguyen

3..Voi cac chu so 0;4;6;8.Hoi lap duoc bao nhieu so thap phan co du 4 chu so da cho ma co 3 chu so o phan thap phan

4..Voi cac chu so 0;2;4;6.Hoi lap duoc bao nhieu so thap phan co du 4 chu so da cho ma co 2 chu so o phan thap phan

cho tich M = 0.9*1.9*2.9*3.9*...*99.9

a.hay cho biet tich M co bao nhieu thua so

b.tich M co tan cung bang chu so nao

c.tich M co bao nhieu chu so o hang thap phan

vi tich sau co chu so tan cung la so nao va co bao nhieu chu so thap phan ?0,9*1,9*2,9*3,9*.....*18,9