tich 1*2*3*4*5*6*7*8*9*10*11*12*...*50 co ba0 nhieu so 0
Ta co 1*2*3*4*5*6*......*50 hoi tich tre co bao nhieu so 0
bai 1 on cay hinh chu nhat co chu vi la 0, 04 km va chieu rong bang 3/5 chieu dai . Hoi dien tich vuon do bang bao nhieu met vuong , bao nhieu hec ta?
bai 2:Mot cua hang da ban duoc 50 bao gao, moi bao can nang 60 kg. Gia ban moi tan la 450 000 dong.Hoi cua hang do ban so gao tren duoc bao nhieu tien
bai 3: Mot ngay co 5 xe oto cho hoc ve kho, trung binh moi xe cho duoc 3500kg thoc. Hoi trong 5 ngay doan xe cho duoc bao nhieu tan thoc.
bai 4 cho biet 3,164 be hon 3,1 nhan 4. Tim gia tri cua x
bai 5 tinh nhanh
[1- 1/2] : [1-1/3] :[1-1/4] : [1-1/5] : [1-1/6]
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
1. tim A biet :
A = 1/2 x 1/4 x 1/8 x 1/16 x 1/32 x 1/64 x 1/128 x 1/256 x 1/512 x 1/1024
2. tim chu vi cua 1 hinh vuong biet neu giam canh cua hinh vuong do 5 cm thi dien tich giam di 385 cm2
3. co ba nhieu so co 3 chu so ma moi so deu co mot chu so 0
4. tong so tuoi cua 2 anh em hien nay la 30 tim tuoi em hien nay biet khi tuoi anh bang tuoi em hien nay thi tuoi anh gap tuoi em 2 lan
5. 1 day nha co 40 nha so nha cua 40 nha do danhla cac so lien tiep tang dan tong cac so do la 3560. so nha cua nha cuoi cung la bao nhieu
6. cho hinh tam giac ABC tren canh AB lay diem M, N sao cho AM = 1/3 AB. AN bang 1/4 AC dien tich BMNC la 24 cm2 tinh dien tich ABC
HSG
Tong cua bon so tu nhien la so lon nhat co 7 chu so .Neu xoa di chu so hang don vi cua so 1 thi duoc so 2. so thu 3 bang hieu cua so 1 va so 2.so be nhat la tich cua so be nhat co ba chu so va so lon nhat co bon chu so .tim so thu 4
2: ban An co 170vien bi gom 2 loai :bi xanh va bi do .Ban An nhan thay 1/9 so bi xanh bang 1/8 so bi do .hoi ban An co bao nhieu bi moi loai
1+2+3+4+5+6 +7+8+9+....+2015+2016. hoi day tren co bao nhieu chu so 1
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?
tich cac so tu 1 den 50 co bao nhieu chu so 0 o tan cung