Solving equation 1 / X-2 = 2 / x + 4 / x2-2x

Solving equation 1 / X-2 = 2 / x + 4 / x2-2x

x=2(x-2)+4;
x=2x-4+4；
x=0;
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A cabinet has five drawers, each of which is 80cm long, 50cm wide and 20cm high. How many square decimeters of wood do these drawers need

The drawer has only five sides and no top, that is, the length × width does not need to be multiplied by 2
(80 × 50 + 80 × 20 × 2 + 50 × 20 × 2) × 5 = 46000 square centimeter = 4.6 square meter

A kind of rectangular wood drawer is 3 decimeters long and 2 decimeters wide. How many square decimeters of wood do you need to make 50 wood drawers

(3 × 2 + 3 × 1 × 2 + 2 × 1 × 2) × 50 = 800 (square decimeter)
A: to make 50 of these wood drawers, you need at least 800 square decimeters of wood

The length, width and height of the wood board are 2.8 decimeters, 1.5 decimeters and 2.2 decimeters respectively. How many square meters of wood board should be used to make five such drawers?

(2.8 × 2.2 + 1.5 × 2.2) × 2 + 2.8 × 1.5 = 9.46 × 2 + 4.2 = 18.92 + 4.2 = 23.12 (square decimeter), 23.12 × 5 = 115.6 (square decimeter) = 1.156 (square meter); a: to make five such drawers, at least 1.156 square meters of wood board should be used

A drawer is 6 decimeters long, 4 decimeters wide and 2 decimeters high. How many square meters of wood do you need to make such a drawer?

6 × 4 + 4 × 2 × 2 + 6 × 2 × 2 = 24 + 16 + 24 = 64 (square decimeter) = 0.64 (square meter) answer: it needs at least 0.64 square meter board to make such a drawer

Make a cuboid drawer with a volume of 96 cubic decimeters, 8 decimeters in length and 6 decimeters in width. How many square decimeters of wood board does it take to make such a drawer? Who knows

You get the height first, and then you get the surface area from the three sides of the cuboid
Let height = h, then 6 * 8 * H = 96 → H = (96 / 6) / 8 = 2DM
S = (2 * 6 + 2 * 8 + 6 * 8) * 2 = 76dm ^ 2

To make a wooden drawer 50 cm long, 60 cm wide and 20 cm high, at least use 74 square decimeters of wood. Its volume is

How many square centimetres of wood should be used to make a drawer 45 cm long, 40 cm wide and 20 cm deep?

At least: 2 × (45 × 40 + 45 × 20 + 40 × 20)
=2×3500
=7000 (square centimeter)

How many square centimeters of wood should be used to make a drawer 50 cm long, 40 cm wide and 12 cm deep?

50 × 40 + 50 × 12 × 2 + 40 × 12 × 2 = 2000 + 1200 + 960 = 4160 (square centimeter) a: at least 4160 square centimeter of wood should be used

How many square centimetres of wooden board should be used to make a wooden box (without cover) 50cm long, 40cm wide and 16cm deep?

50×40+40×16×2+16×50×2
=2000+1280+1600
=4880 square centimeters
A: at least 4880 square centimeters of wood should be used