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A rectangular cardboard box, 10 cm long, 6 cm wide, 5 cm high, 1 square meter cardboard, how many cardboard boxes can be made? (excluding interfaces)
1 square meter = 10000 square centimeter, 10000 ^ [(10 × 6 + 6 × 5 + 5 × 10) × 2] = 10000 ^ [(60 + 30 + 50) × 2] = 10000 ^ [140 × 2] = 10000 ^ 280 ≈ 35 (pieces) answer: you can make 35 such cardboard boxes
A rectangular cardboard box, 10 cm long, 6 cm wide, 5 cm high, with 1.4 square meters of cardboard, can be used to make such cardboard
First calculate the surface area of the rectangular cardboard box
Surface area = 10 * 6 * 2 + 10 * 5 * 2 + 6 * 5 * 2 = 280 square centimeters
Because 1 square meter = 10000 square centimeters
So 1.4 square meters = 14000 square centimeters
14000/280=50
A: you can make 50 such cartons
A rectangular cardboard box, 10 cm long, 6 cm wide, 5 cm high, 1 square meter cardboard, how many cardboard boxes can be made? (excluding interfaces)
1 square meter = 10000 square centimeter, 10000 ^ [(10 × 6 + 6 × 5 + 5 × 10) × 2] = 10000 ^ [(60 + 30 + 50) × 2] = 10000 ^ [140 × 2] = 10000 ^ 280 ≈ 35 (pieces) answer: you can make 35 such cardboard boxes
A rectangular cardboard, along the length and width minus 2.5cm of small paper, the area is reduced by 28cm2, the original perimeter is?
With the equation, say the process, urgent ~ ~ thank you~
28-2.5*2.5=21.75cm2
21.75/2.5=8.7cm
（8.7+2.5*2）*2=27.4cm
Do you understand?
A rectangular cardboard, along its length and width minus a 2.5cm wide small strip of paper, area than the original area reduced by 28 square centimeters, the original perimeter of this cardboard is______ Cm
(28.5 △ 2.5 + 2.5) × 2, = (11.2 + 2.5) × 2, = 13.7 × 2, = 27.4 (CM), answer: the original perimeter of rectangular paperboard is 27.4 cm
When the length and width of a rectangle increase by 5 cm, its area increases by 125 square cm?
Let the length of the original rectangle be x cm and the width be y cm. According to the meaning of the title, the area of the added rectangle - the area of the original rectangle = 125 square cm. The equation is as follows: & nbsp; & nbsp; & nbsp; & nbsp; (x + 5) × (y + 5) - xy = 125 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; XY + 5x + 5
In 5 cm, 4 cm wide rectangular cardboard, a total of () 1 square centimeter square can be placed, the area of this rectangle is () square centimeter
In 5 cm, 4 cm wide rectangular cardboard, a total of (20) 1 square centimeter square can be placed, the area of this rectangle is (20) square centimeter
A rectangular cardboard, cut from the four corners of the side length of 5 cm square, this cardboard area is how many square centimeters?
The answer is 2000 square centimeters,
After cutting off four corners, the length is 40cm and the width is 30cm
40 + 5 * 2 = 50cm
30 + 5 * 2 = 40 cm
S=ab
=50*40
=2000
A: the area is 2000 square centimeters
study hard and make progress every day!
A piece of square cardboard 10 cm long and 9 cm wide cut him into the largest square, the area is several percent less than the original
10×9=90（cm） 9×9=81(cm) 90-81=9(cm) 9÷90=0.1=10%
The area is less than the original = (10-9) * 9 / 10 * 9 = 10%
A 10 cm long, 9 cm wide rectangular cardboard, cut it into the largest square, the area is less than the original
By what percentage
9 × (10-9) = 9 square centimeters
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