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Cho 4 so 80 ; 90 ; A va b . HOi so A va B bao nhieu don vi biet so a nho hon trung binh cong cua 3 so 80 90; va a la 4 . So b lon hon trung binh cong cua ca 4 so la 12
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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 MH1/3 AH.NOI M VOI B,BH6,4 CM;HC7,2 CM.TINH DIEN TICH HINH TAM GIAC ABC,BIET DIEN TICH HINH TAM GIA BMH LA 11,2 CM V...
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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?