1) 1 cai thung ko nap dang HHCN co CD 9m, CR kem CD 3m,Cao 4m. Tinh dien tich ton de lam thung, biet rang dien tich cac mep hang la 1,05m2
2) Hop thu nhat co the tich la 4dm3 5cm3, hop thu hai co the tich bang 4/5 the tich hop thu nhat. Hoi hop thu hai co the tich la bao nhieu cm3?