1, solution: surface area = 2 * (12 * 4+12 * 6+4 * 6) = 288 cm2; Volume = 12 * 4 * 6 = 288 cubic centimeters;

2. Surface area = 6 * 4 2 = 6 *16 = 96cm2, volume = 4 3 = 4 *16 = 64cm3;

3. Surface area = 2 * (8 * 5+8 * 5+5 * 5)+2 * (5+5) * 5 = 310cm2, volume = 5 3+8 * 5 * 5 = 325cm3.