1.tim so bi chia trong phep chia cho 12 co thuong la 35 va so du la so le co 2chu so

2.hieu cua so lon nhat co 4 chu so khac nhau va so nho nhat co 4 chu sola bao nhieu

3.mot hinh chu nhat co chieu dai gap ruoi chieu rong. Neu moi chieu tang them 1m thi duoc hinh chu nhat moi co dien tich tang them 26m2. Tinh chu vi hinh chu nhat

4.trung binh cong cua 2 phan so bang 5/12. Phan so thu nhat hon phan so thu hai 1/6. Tim phan so thu nhat

5.tim y biet (5/7 - y) nhan 4/5 =7/10 + 1/2

6.hieu 2 so =1/3 so be.Tong 2 so la 63. Tim so be

Bai 1: Cho day so : 10; 13; 16; 19... 

a) so 2002 la so hang thu bao nhieu cua day

b) Tim so hang Thu 107 cua day 

Bai 2: tinh tong cua day so sau : 

2; 4; 6; 8... 78; 80

Bai 3 : Cho day so 

3; 6; 12; 24; 48... 

Cac so 666;  2004 co thuoc day khong 

Bai 4 : cho day 3; 18; 48; 93; 153...  

a ) Tim so hang Thu 100 cua day 

b ) so 11703 la so hang Thu bao nhieu cua day

Ai nhanh minh  tick! 

Bai1:hieu cua 2 phan so bang 2\(\frac{3}{7}\)phan so thu nhat bang \(\frac{1}{4}\)phan so thu hai.Tim phan so thu 2

Bai 2:nam nay tuoi me hon tuoi con la 25 tuoi.Hai nam truoc day,tuoi me bang \(\frac{7}{5}\)hieu so tuoi hai me con.Vay me nam nay bao nhieu tuoi ?

Bai 3:truoc day mua 5 lit dau phai tra 120000 dong .hien nay gia moi lit dau tang len 6000 dong .hoi voi 120000 dong thi hien nay co the mua duoc bao nhieu lit dau nhu the ?

Bai 4:tim so chan nho nhat co bon chu so sao cho khi chia cho 369 thi co so du lon nhat ?

Bai 5:khi danh so trang 1 quyen sach nguoi ta thay trung binh moi trang phai dung hai chu so . Hoi quyen sach  do co bao nhieu trang 

Bai 6:cho day so tu nhien lien tiep 1;2;3;4;5;...x

tim x biet day so tren co 1989 chu so

Bai 7:tim so trung binh cong cua tat ca cac so le co hai chu so chia het cho 5

1. Tim trung binh cong cua tat ca cac so tu nhien co 4 chu so khac nhau duoc viet boi bon chu so 0;3;5;7.Trung binh cong cua tat ca cac so do la?

2 .Tong cua 3 so bang 5,2. So thu nhat bang 2/3 so thu ba va so thu hai bang 50% so thu ba. Tim so thu hai?

3. Tim mot phan so co mau so bang 25 , biet rang neu cong tu so voi 34 va nhan mau so voi 3 thi duoc phan so moi bang phan so da cho. Tim phan so do?

4. Tim mot phan so biet rang neu cong them 4 vao tu so va giu nguyen mau so thi ta duoc phan so moi bang 1, con neu giu nguyen tu so va cong them 3 thi ta duoc phan so moi bang 1/2 .Tim phan so do?

5. Hay cho biet co tat ca bao nhieu so co 3 chu so ma tong co chu so cua moi so bang 4 . co tat ca bao nhieu so thoa man?

a , hay viet 55 thanh tong cua cac so tu nhien lien tiep

b,1 day pho co 15 nha duoc danh la day le lien tiep.tong cua 15 so nha la 915 .Tim so nha dau tien va so nha cuoi cung

c, cho day so co 11 so hang co tong = 176. biet hieu cua so dau va so cuoi la 30 . hay viet day so do

d,1 day so tu nhien cach deu co tan cung la 2 . Cac so deu chia het cho 4 . Tim so thu 112 cua day roi tinh tong biet so dau tien la so nho nhat co 3 chu so

   giai ho minh nhe,thank you. 

CAU 1; CHO 2 SO DEU CO 2 CHU SO,TONG CUA 2 CHU SO BANG 46.NEU GHEP SO BE VAO BEN PHAI,HOAC GHEP SO BE VAO BEN TRAI SO LON THI DUOC 2 SO DEU CO 4 CHU SO;HIEU CUA HAI SO NAY BANG 2178.TIM 2 SO DA CHO?

CAU 2;TIM 4 SO CO TRUNG BINH CONG LON HON SO THU NHAT LA 98 BE HON SO THU HAI LA 7,BANG NUA SO THU BA VA GAP DOI SO THU TU.

CAU 3; HINH TAM GIAC ABC CO CHIEU CAO AH.TREN AH LAY M SAO CHO MH=1/3 AH.NOI M VOI B,BH=6,4 CM;HC=7,2 CM.TINH DIEN TICH HINH TAM GIAC ABC,BIET DIEN TICH HINH TAM GIA BMH LA 11,2 CM VUONG.

CAU 4;CHO DAY SO ....64;81;100;121;144.TIM SO HANG DAU TIEN CUA DAY SO BIET DAY SO CO MUOI SO HANG.

CAU 5;NGUOI TA MUA MOT BAO MI CHINH CAN NANG 50 KG VAO CAC TUI NHO .MOI TUI DUONG 450 GAM THI THIEU 11 TUI VA THUA 50 GAM.HOI NEU CHIA VAO MOI TUI 800GAM THI CO THUA BAO NHIEU TUI.

CAU 6;1 NGUOI BAN HOA QUA,NGAY DAU BAN DUOC 20 KG.BIET SO HOA QUA NGAY DAU BAN DUOC BANG 80% CUA NGAY THU HAI ,SO HOA QUA CUA NGAY THU HAI BANG 125% CUA NGAY THU BA VA BANG 80% CUA NGAY THU 4.HOI TRONG 4 NGAY BAN DUOC BAO NHIEU KG?