Use a 48 cm long wire to form a rectangle. The ratio of length to width is 5:3. What is the area of the rectangle?

Use a 48 cm long wire to form a rectangle. The ratio of length to width is 5:3. What is the area of the rectangle?

48 △ 2 = 24 (CM), 24 × 55 + 3 = 15 (CM), 24-15 = 9 (CM), 15 × 9 = 135 (square cm); answer: the area of a rectangle is 135 square 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

Write a polynomial containing only the letter M, and satisfy the following conditions: 1. The polynomial has three terms, 2. The degree of its highest degree is 2, and the coefficient is - 1
When m = 1.5, the value of this polynomial is obtained

－m²＋m－3／2
When m = 1.5, - M & # 178; + M-3 / 2 = - 2.25 + 1.5-1.5 = - 2.25

Wang Zhuang's weight is 39 kg. How many kg does his blood contain?

39 × 113 × 23 = 2 (kg) a: his blood contains about 2 kg of water

If f (x) = 2x-1, then f (x + 1) equals ()
A. 2x-1B. x+1C. 2x+1D. 1

From F (x) = 2x-1, f (x + 1) = 2 (x + 1) - 1 = 2x + 1, so C

5:3 of 6 = x: please answer in 1 minute,

5/6:3=x：36
3x=5/6*36=30
x=10

In triangle ABC, angle a is twice as big as angle B, and the sum of angle A and angle B is 18 times smaller than angle C. calculate the degrees of these three angles respectively. What triangle is this?

As the sum of angle A and angle B is 18 degrees smaller than angle c, so ∠ C = ∠ a + ∠ B + 18 degree = 3 ∠ B + 18 degree, and ∠ a + ∠ B + 18 degree = 180 degree, so 2 ∠ B + ∠ B + 3 ∠ B + 18 degree = 180 degree, so ∠ B = 27 degree, a = 2 × 27 degree = 54 degree, C = 3 × 27 degree

F (x) = LIM (1 + x) / (1 + x ^ (2n)) n - > find the breakpoint between infinity
Why don't we consider x = - 1 instead of x = 1?
I also feel that it is because f (x) = 0, but is there any basis for this judgment?

For a given x
When | x | > 1, the function value is 0
When | x | = 1, it is 1 when x = 1, and 0 when x = - 1
When | x|

There are three classes in the fifth grade of sunshine primary school. The number of students in one class is 1.2 times of that in the third class. The number of students in the second class is 3 less than that in the third class. There are 157 students in the three classes. How many students are there in each class

There are three classes of X people, one class is 1.2x, and the other class is x-3
X+1.2X+X-3=157
3.2X=160
X=50
1.2*50=60
50-3=47
There are 60, 47 and 50 students in three classes

-2 - 8064 (?) number reasoning problem, civil servants
-2 -8 0 64 （?）
A -64 B 128 C 156 D 250
The answer is D, but I'm not satisfied with the explanation. Who can help me? Thank you!

(- 1) ^ 3 * (- 2) (- 2) ^ 3 * (- 1) (- 3) ^ 3 * 0 (- 4) ^ 3 * 1 (- 5) ^ 3 * 2 = 250 understand?