1. tbc cua 3 so la 19/60 .neu gap so thu nhat len 4 lan thi tbc cua chung se la 13/20 .tim 3 so , biet so thu hai hon so thu ba 1/6
2. trong mot phep tru co tong so bi tru ,so tru va hieu la 1998.biet hieu so bang 4/5 so tru .hay tim so bi tru va so tru , hieu
Tbc cua 3 so la 975. So thu 2 gap ruoi so thu 3 va bang 3/10 so thu nhat. Tim so thu ba
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TBC cua so thu nhat va so thu nhat va so thu hai la 8.5 TBC cua so thu hai va so thu ba la 8,1 TBC cua so thu nhat cua so thu ba la 7,35 Tim so lon nhat
TBC cua 3 so la 680. So thu 3 gap ruoi so thu 2. so thu nhat bang60% SO THU 3.TIM SO THU NHAT
TBCcua 3so la 5/8 so thu 3 bang TBC cua so 1va2so 1 >2la 14 tim 3 so
TBC cua 3 so la 20 neu tang so thu nhat len 2 lan thi TBC cua chung la 24 neu tang so thu 2 len 3 lan thi TBC cua chung la 32 tim so thu 3
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?
TBC cua ba so la 1996 . tim so thu tu biet rang so do bang tbc cua ba so kia
Trung binh cong cua 3 phan so =31/90.Nêu tang phan so thu hai len gap hai lan thi tbc cua 3 phan so =23/45.Biet phan so thu 2 hon phan so thu 3 la 2/15.Tim phan so thu 1?
