The area of a rectangle is 864 square meters. It is known that its length is 12 meters longer than its width. How many meters is the sum of its length and width?

S = AB, area formula, area = length * width, where length is 12 cm longer than width, then we can replace length with width, that is, a = B + 12. In this way, we can solve the equation, 864 = (B + 12) B. in this way, according to the decomposition, we can get a quadratic equation of one variable: b square + 12b-864 = 0. The answer is: length is 36 cm, width is 24 cm, The sum of length and width is 60cm. Attachment: what grade is LZ now? If I can't understand it, I'll think about other simple methods

If you reduce the length and width of a large rectangle by 8 meters, the area will be reduced by 864 square meters. If you want to reduce the area of a small rectangle, the length of a small rectangle is 12 meters

Let the original length and width be x, y
xy-（x-8）（y-8）=864；
xy-xy+8x+8y-64=864；
x+y=116；
x=12+8=20；
y=116-20=96；
Current area = (20-8) × (96-8) = 1056 square meters
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The circumference of a rectangle is 48 meters, the length is 5 / 3 of the width. How many square meters is the area of this rectangle?

Answer: length + width = 24, length is 5 / 3 of width, width: 24 ÷ (1 + 5 / 3) = 9, length: 9x5 / 3 = 15, area: length x width = 15 / 9 = 135

Use a 200cm long wire to form a rectangle. The ratio of length to width is 3:2. What is the area of the rectangle?
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200 ／ 2 ／ (3 + 2) × 3 = 60cm (length)
Width = 200 △ 2-60 = 40 cm
Area = 2400 × 60 cm 2

Use a 314cm long iron wire to form a rectangle. The ratio of length to width is 3:2. What's the area of the rectangle

Length: 314 ／ 2 ／ (3 + 2) × 3 = 94.2 cm
Width: 314 ／ 2 ／ (3 + 2) × 2 = 62.8 cm
Area: 94.2 × 62.8 = 5915.76 cm and 178 cm;

Use a 100 cm long wire to form a rectangle. The ratio of length to width is 3:2. How many square centimeters is the area of the rectangle?

The length of the rectangle: (100 △ 2) × 33 + 2 = 30 (CM), the width of the rectangle: (100 △ 2) × 23 + 2 = 20 (CM), the area of the rectangle: 30 × 20 = 600 (square cm); a: the area of the rectangle is 600 square cm

A 48 cm long wire is used to encircle a rectangle with a length to width ratio of 3:1. The area of the rectangle is () square centimeter

Length = 3 times width
Perimeter = (length + width) × 2 = (3 times of width + width) × 2 = 4 times of width × 2 = 8 times of width = 48 cm
Width = 48 △ 8 = 6cm
Length = 3 times width = 18 cm
The area is length × width = 18 × 6 = 108 square centimeters

Use a 24 meter long iron wire to form a rectangle. The length is five times the width. What is the length and width? What is the area of the rectangle?
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Let the width be x and the length be 5x
The perimeter is 24, which means 2 * (x + 5x) = 24
So x = 2
Length is 2 * 5 = 10, width is 2
The area is 10 * 2 = 20

(2x ^ 3y-4x ^ 2Y ^ 3-7xy ^ 3) / (- 2XY) writing process
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(2x^3y-4x^2y^3-7xy^3)÷(-2xy)
=xy(2x^2-4xy^2-7y^2)/(-2xy)
=-1/2(2x^2-4xy^2-7y^2)

There is a rectangle, its length is 2A + 3, its width is less than the length B + 3, the area of the rectangle?

Width of rectangle: 2A + 3-b-3 = 2a-b
The area of rectangle: (2a + 3) (2a-b) = 4A & # 178; - 2Ab + 6a-3b

The area of a rectangle is 864 square meters. It is known that its length is 12 meters longer than its width. How many meters is the sum of its length and width?