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!
10;11;12;13;14;...;x
tim x de so gap 4 lan so so hang trong day
bai nay la bai tinh nhanh nen cac ban giai ra cho minh nhe !
tinh tong sau :
1,2+2,3+3,4+4,5+...........+97,98+98,99+99,100
bai 1: tong so tuoi cua ong, bo va Nam la 108 tuoi. Tuoi cua ong gap 4\5 tong so tuoi cua Nam va bo. Tuoi cua bo Nam gap 3 lan tuoi Nam. Hoi so tuoi cua tung nguoi ?
bai 2: Hung cat soi day thep dai 22,19 m thanh 2 doan ma doan ngan = 3\4 doan dai. Tinh chieu dai moi doan day ?
bai 3: Cho 2 so thap phan 14,78 va 2,87. Hay tim so A sao cho them A vao so nho, boi so lon ta duoc 2 so co ti so la 4.
bai 4: Moi o to di quang duong dai 300 km. O to di voi van toc 60 km\ h va da di duoc 1h 40 phut. Hoi o to da di duoc may phan quang duong AB?
Bai 1: mot khu dat HCN co chu vi la 2km5hm, chieu dai gap 4 lan chieu rong.Tinh dien tich khu dat do may met vuong ? may ha?
Bai 2: Nam nay tong so tuoi cua 2 bo con la 40 tuoi, biet rang sau 4 nam nua thi tuoi con bang 1 phan 3 tuoi bo. Hoi nam nay bo bao nheu tuoi , con bao nhieu tuoi?
Bai 3: Thuong cua 2 so la 0,6. Hieu cua 2 so la 52. Tim hai so do?
Bai 4:Tinh nhanh
a) 35x18-9x70+100
b) 4x 113x 25-5x 112 x 20
c) { 20 + 21 +22 +23+24+25}x{16-2×8}
giai ho minh bai toan nay voi nhe! bai toan nguoi ta do day dau vao cac can loai 1,2,3.thi thay tong so dau trong cac can cua moi loai deu bang nhau.hoi can loai 1 nhieu hon can loai 3 la bao nhieu cai?biet so dau cua can loai 1 bang 2/3 so dau cua 1 can loai 2 va bang 2/3 so dau cua 1 can loai 3.Va tong so can cua 3 loai la 62 cai
giai ho minh bai toan nay voi nhe! bai toan nguoi ta do day dau vao cac can loai 1,2,3.thi thay tong so dau trong cac can cua moi loai deu bang nhau.hoi can loai 1 nhieu hon can loai 3 la bao nhieu cai?biet so dau cua can loai 1 bang 2/3 so dau cua 1 can loai 2 va bang 2/5 so dau cua 1 can loai 3 .Va tong so can cua 3 loai la 62 cai.
Nói luôn cách làm
Bai 1; Cho hinh thang abcd co day cd gap 3 lan day ab cac canh ben da va cb keo dai cat nhau tai e.
a/So sanh AE voi ED, EB voi EC
b/Tinh dien tich hinh thang biet dien tich tam giac EAB la 4 cm2
Bai 2; Tim chu so tan cung cua tong sau. hay giai thich:
(21 x 22 x 29 x 36 x 74 x 65) + ( 94 x 104 x 24 x 64 x 84)
Bai 3; ban an luc 7 gio di tu a den b voi van toc la 12 km/h. mot gio sau ban dung duoi theo voi van toc la 16 km/h. den may gio thi ban dung duoi kip ban an ?
tong chieu dai cua 3 tam vai la 112m sau khi ban bot 3/7 tam vai xanh ,1/5 tam vai do va 2/5 tam vai trang thi phan con la cua ba tam vai bang nhau tim chieu dai moi tam vai can gap lam bai giai day du