Bài 1:cho day so 1;3;5;7;......;x( gom 10 chu so)
a) tim tong cua day so
b) tim trung binh cong cua day so
Bài 2: co ba ban choi tem. an co so tem bang trung binh cong cua ca ba ban. so tem cua hung nhieu hon trung binh cong so tem cua ca ba ban la 6 con tem. phong co 18 con tem. hoi an va hung moi ban co bao nhieu con tem?
neu ai khong biet violympic vong 16 la day
cau 1:me hon con 30 tuoi neu cong them vao tuoi me so tuoi cua con thi duoc mot so bang 5/4 so tuoi me :tuoi me la 40 tuoi ,con 10 tuoi
cau 2:3/4 cua 20 m la: 15 m
cau 3:5/6 cua 24 kg la :20 kg
cau 4:neu 5/6 cua q kg la 105 kg thi q la :126
cau 5:neu 3/4 cua t la 186 thi t la :248
cau 6:mot hinh chu nhat co chu vi bang 3 lan chieu dai biet chieu rong bang 20m tinh chieu dai hinh chu nhat : chieu dai hinh chu nhat la 40 m
cau 7:1 chiec thuyen cho 36 thung hang .moi thung hang nang 5/9 ta .hoi chiec thuyen cho bao nhieu tan hang :2 tan
cau 8:8*(28 +22)+(138+362):5=500
cau 9:435 +24:y=500-65+24:3:vay y =3
cau 10: tim so co 4 chu so 1c20 lon nhat chia het cho ca 2;3 va 5 :so do la 1920
chuc cac ban thi tot
Tim so co 3 chu so biet so do la trung binh cong cua 678 va 56
Bai 1. mot cua hang ngay thu nhat ban duoc 350 ta gao.ngay thu hai ban duoc gap doi ngay dau.hoi trung binh moi ngay ban duoc bao nhieu ta gao
Bai 2. trung binh cong cua hai so la so lon nhat co hai chu so.biet mot so la 89.tim so con lai
Bai 3. cho manh dat hinh chu nhat co nua chu vi la 24cm.chieu rong kem chieu dai 12cm.tinh chieu dai.chieu rong manh dat.
Bai 4. cach day 7 nam.tuoi me va tuoi con cong lai la 42 tuoi.con kem me 24 tuoi.tinh tuoi moi nguoi hien nay
Co 4 Xe tro Hằng , 3xe day Trung Binh Môi Xe cho duoc 45 ta Hằng. Xe Thu 4 cho duoc so Hằng Nhien hon Trung Binh Công so Hằng cua ca 4 Xe la 15 ta va it hon so hang cua ca 2 Xe day la 24 ta . Boi Xe Thu 3 tro duoc Báo Nhien ta hang
Tinh dien tich cua mot manh dat trong hoa trong cong vien co dang hinh binh hanh co chieu cao bang 1 phan 3 do dai day.Biet do dai day cua manh dat [do bang met]la mot so lon hon 40 va be hon 45,vua chia het cho,vua chia het cho 3.
trung binh cong cua tat ca cac so co 2 chu so chia het cho 7 la
trung binh cong cua so thu 1 va so thu 2 la 5/12. trung binh cong cua so thu 1, so thu 2 va so thu 3 la 19/36. trung binh cong cua bon so la 143/240 va so dau kem trung binh cong cua hai so cuoi 11/40 don vi. tim bon so do
trung binh cong cua cac so co 3 chu so chia het cho 3 la bao nhieu