If one side of a rectangle is equal to 3m + 2n and the other side is M-N smaller than it, the perimeter of the rectangle is______ ．

If one side of a rectangle is equal to 3m + 2n and the other side is M-N smaller than it, the perimeter of the rectangle is______ ．

According to the meaning of the title, the other side is 3M + 2n - (m-n) = 2m + 3N, so the perimeter of the rectangle is 2 (3m + 2n + 2m + 3n) = 10 (M + n)

One side of the rectangle is 3M + 2n, and the other side is M-N larger than it

（3m+2n)(3m+2n+m-n)
=(3m+2n)(4m+n)
=12m²+3mn+8mn+2n²
=12m²+11mn+2n²

The side length of a square is tripled and the perimeter is enlarged______ The area is enlarged______ Times. A.3 & nbsp; & nbsp; B.9 & nbsp; & nbsp; c.37

According to the meaning of the question, suppose that the side length of the square is a, then its perimeter = 4A, area = A2; if the side length of the square is expanded three times, its side length = a × 3 = 3A, then its perimeter = (3a) × 4 = 12a, area = (3a) 2 = 9A2

The perimeter of a square tablecloth is 4.2 meters. How many square meters is its area?

Side length of square = 4.2 △ 4 = 1.05M
Its area = 1.05 × 1.05 = 1.1025 square meters

Use a piece of square paper with a side length of 20 cm to cut and paste it into a cuboid carton without cover. The cuboid carton should have a volume of more than 550 cubic cm
The carton you designed is cm in length, cm in width, cm in height, and cm in volume

Remove a 3 * 3 small square from the four corners of the square, and then stand up along the cut part
(20-3-3) (20-3-3) * 3 = 588 CC

A piece of square paper with side length of 20 cm is cut and pasted into a rectangular carton without cover, so that its volume is greater than 550 cubic cm
The carton you designed is () cm in length, () cm in width and () cm in height

Cut off the two adjacent corners of the square, and stick them to the center of the side without cutting corners. In this way, you can paste them into a rectangular carton with the bottom side length of 20-5 = 15cm and the height of 5cm. The carton is 15cm long, 15cm wide and 5cm high
Its volume is 15 * 15 * 5 = 1225 cubic centimeters

Cut and stick a piece of square paper with side length of 20 cm into a cuboid carton without cover, so that its volume is more than 550 cubic cm
Length () cm, width () cm, height () cm
What is the area of the carton

Bright always
Four corners, 2.5cm small squares each,
Form a length (15) cm, width (15) cm, height (2.5) cm carton without cover
Volume = (15 × 15 × 2.5) cm3 = 562.5 cm3, greater than 550 cm3
Carton area = (15 × 15 + 15 × 2.5 × 4) square cm = (225 + 150) square cm = 375 square cm
Good luck and goodbye

A rectangular carton, the bottom is a side length of 20 cm square, the height is 15 cm. Stick a circle of trademark paper on its side
How many square centimetres is the area of trademark paper at least? It's urgent to note that it's a circle on the side, not all around

20 * 15 = 300 * 4 = 1200 (cm2)

A rectangular paper box with a square bottom, if the side of it is unfolded, it is just a square with a side length of 20 cm. What is the volume of this paper box
Less cubic decimeter? Note that the upper unit is centimeter and the lower is decimeter

20 / 4 = 5cm. This is the length and width of a cuboid
5 * 5 * 20 = 500 (cm3)
This is the volume of a cuboid
0.5 cubic decimeter

There is a 30 cm long, 20 cm wide rectangular piece of hard paper, cut from the four corners of the side length of 5 cm square, make a carton. How many cubic centimeters of the carton volume?

(30-5 × 2) × (20-5 × 2) × 5, = 20 × 10 × 5, = 1000 (CC). A: the volume of the carton is 1000 CC