Use two cuboids 8 cm long, 5 cm wide and 3 cm high to form a cuboid with the smallest surface area. How many square centimeters is the surface area of this cuboid? 2. Use two cuboids 7 cm long, 3 cm wide and 2 cm high to form a cuboid with the largest surface area. How many square centimeters is the surface area of this cuboid?

Use two cuboids 8 cm long, 5 cm wide and 3 cm high to form a cuboid with the smallest surface area. How many square centimeters is the surface area of this cuboid? 2. Use two cuboids 7 cm long, 3 cm wide and 2 cm high to form a cuboid with the largest surface area. How many square centimeters is the surface area of this cuboid?

Stick the two largest faces together, and reduce the most, so the remaining area is the smallest / vice versa
1、(8X5＋8X3＋5X3)X2X2－8X5X2＝236
2、(7X3＋7X2＋3X2)X2X2－3X2X2＝152

How many centimeters is the sum of the edges of the cuboid? What's the surface area in square centimeters?

The length of the assembled cuboid is: 8 × 3 = 24 (CM), the width and height are 8 cm, the sum of edge length: (24 + 8 + 8) × 4 = 160 (CM); surface area: 8 × 8 × 6 × 3-8 × 8 × 4 = 1152-256 = 896 (square cm); answer: the sum of edge length of the cuboid is 160 cm, the surface area is 896 square cm

Two identical rectangles, 8 cm long, 5 cm wide and 3 cm high, are used to form a cuboid with the largest surface area. The surface area of the cuboid is () square centimeter

When two cuboids are combined into a large cuboid, the surface area of the cuboid will be reduced by two sides (because the two sides are put together). To make the surface area of the cuboid the largest, the area reduced is the least, that is, the smallest surface of the two cuboids is put together
So the maximum surface area = (8 * 5 + 8 * 3 + 3 * 5) * 2 * 2-3 * 5 * 2 = 286 (cm2)
The surface area of the cuboid is (286) square centimeters