Cho cac phan so : 1/2;3/4;1;5/4;3/2.

a)nhan xét ve cach viet day phan so do.

b) viet tiếp 3 phan so vào day phan so do.

khan cap nhanh len cac ban oi!!!!

cho day so 1/2 ; 2/1 ; 1/3 ; 2/2 ; 3/1 ; 1/4 ; 2/3 ; 3/2 ; 4/1;.................hoi phan so 1/2017 la so thu bao nhieu trong day 

vong huyen day

1) co bao nhieu so co 3 chu so ma ko chia het cho 5

2) tim so hang thu 100 cua day so: 1; 4;9;25;36...

3) tim phan so thu 100 cua day phan so:

1/2; 1/6; 1/12; 1/20; 1/30...

Cho day phan so:

\(\frac{1}{1};\frac{1}{2};\frac{2}{1};\frac{1}{3};\frac{2}{2};\frac{3}{1};\frac{1}{4};\frac{2}{3};\frac{3}{2};\frac{4}{1}\)

Tim ra phan so 50 cua day so tren

bai 1.A,sap xep cac phan so sau day theo thu tu tu lon den be ;5/6,13/8,8/9 ,1/3 ,3/2 ;B,tim tat ca cac phan so sau cho mau so la so co 2 chu so . Cac ban giup to nhe .

1) Cho 2 so khac nhau . So lon co chu so hang chuc la 7 , chu so hang don vi la 3 . Neu xoa chu so 7 va chu so 3 do ta duoc so be . Hieu cua 2 so do la 9082 . Tim 2 so do ?

2)So sanh A va B :

A = 2008/987654321 + 2009 / 246813579 . Day la phan so

B = 2009/987654321 + 2008 / 246813579 . Day la phan so

viet cac phan so sau day thanh cac phan so co mau so la 10:

1/2 , 2/5 , 1/4 , 18/20 , 15/50 , 10/25 .

cho day so 0.1 , 0.01 , 0.001 ....s/ so hang thu 2007 tren co bao nhieu so 0 o phan thap phan . b/ neu day so co 2007 so hang thi trong day so co tat ca bao nhieu so 0

cho phan so 17/35 tim 1 so nao do sao cho khi cong tu so voi so day va giu  nguyen mau so thi  co phan so moi co gia tri bang 5/7