Use 240 cm iron wire to make a largest cube frame, and then use cardboard to make 6 pieces of bread. At least how many square centimeters of cardboard? What is the volume of the carton in cubic centimeter?

Use 240 cm iron wire to make a largest cube frame, and then use cardboard to make 6 pieces of bread. At least how many square centimeters of cardboard? What is the volume of the carton in cubic centimeter?

240 △ 12 = 20 (CM); 20 × 20 × 6 = 2400 (cm 2); 20 × 20 × 20 = 8000 (cm 3); answer: at least 2400 cm 2 of cardboard is used, and the volume of carton is 8000 cm 3

The box shape of a refrigerator is a cuboid without bottom. It's 140 cm long, 55 cm wide and 52 cm high
How many square centimetres does the packing box need at least

140*55+2（140*52）+2（55*52）=27980
One length multiplied by width (bottom) + two length multiplied by height (front) + two width multiplied by height (side)

The shape of the packing box of a refrigerator is a cuboid without bottom. It is 60cm long, 50cm wide and 140cm high. How much flat does it take to make the packing box
Square centimeter cardboard?

It's very easy. The answer is to calculate one bottom first, and then four sides equal to 60 × 50 + 2 × 50 × 140 + 2 × 60 × 140