tich sau co tan cung la bao nhieu chu so 0 ? 

13 nhan 14 nhan 15 nhan .........nhan 22?

Tich sau co tan cung bao nhieu chu so 0: 

a, 20*21*22*......*40

b,1*2*3*4*......*100

c, 11*12*13*14*......*62

d, 1*5*6*11*17*......*118*191

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 0,1 X 0,0 X 0,001 X 0,0001 X.......X 0,0000...01  ( biet so thap phan nay co 98 chu so 0 ngay sau dau phay ) . Hoi tich do co ket qua bao nhieu chu so 0 , bao nhieu chu so 1 ?? 

bai 12:Mot vuon co so cay buoi bang 1phan2 cay cam,biet so cay cam bang so chan lon nhat co 3 chu so.Hoivuon do co tat ca bao nhieu cay buoi va cam?

bai 13:tim tich cua so nho nhatco ba chu so khac nhau voi so chan lon nhat co mot chu so.

bai 14:tim mot so,biet rang giam so do di 5 lan sau do them 10 don vi thi duoc so le nho nhat co hai chu so.

bai 15:tim mot so biet rang neu gap so do len 4 lan,duoc bao nhieu lai gap len 6 lan thi duoc 360.

bai 13 :tim tich cua so nho nhat co ba chu so khac nhau voi so chan lon nhat co mot chu so.

bai 14 :tim mot so,biet rang neu giam so do di 5 lan sau do them 10 don vi thi duoc so le nho nhat co hai chu so.

bai 15 :tim mot so biet rang neu gap so do len 4 lan,duoc bao nhieu lai gap len 6 lan thi duoc 360

Tich sau co tan cung bao nhieu chu so 0:

    85*86*87*....*94

    11*12*13*.....*62

tich sau co bao nhieu chu so 0 1x2x3x4x......x50

tich sau tan cung co bao nhieu chu so 0

1*2*3*.......*99*100

85*86*87*.......*94

11*12*13*........*62