Given the matrix A = 0 3 3 1 10 - 1 2 3, and ab = a + 2B, how to find the matrix B? Distance matrix A is a 3-order distance matrix. I don't know if I can understand it. I'll write another one now The known matrix A = 0.33, 1 1 0. -1 2 3, and ab = a + 2B for matrix B How should I ask for this?

Given the matrix A = 0 3 3 1 10 - 1 2 3, and ab = a + 2B, how to find the matrix B? Distance matrix A is a 3-order distance matrix. I don't know if I can understand it. I'll write another one now The known matrix A = 0.33, 1 1 0. -1 2 3, and ab = a + 2B for matrix B How should I ask for this?

Because AB = a + 2B
So (a-2e) B = a
(A-2E,A) =
-2 3 3 0 3 3
1 -1 0 1 1 0
-1 2 1 -1 2 3
r1+2r2,r3+r2
0 1 3 2 5 3
1 -1 0 1 1 0
0 1 1 0 3 3
r1-r3,r2+r3
0 0 2 2 2 0
1 0 1 1 4 3
0 1 1 0 3 3
r1*(1/2),r2-r1,r3-r1
0 0 1 1 1 0
1 0 0 0 3 3
0 1 0 -1 2 3
Exchange bank
1 0 0 0 3 3
0 1 0 -1 2 3
0 0 1 1 1 0
So B=
0 3 3
-1 2 3
1 1 0

Let a = (0.33, 1.10, - 1.23) AB = a + 2b to find B

 
Identity transformation, written in the form of two reciprocal matrix multiplication is good. The main idea, the result I am not sure ⊙ ﹏ ⊙

In order to prepare 500ml sodium hydroxide solution (density 1.1g/cm3) with 10% mass fraction, we need more than one gram of sodium hydroxide and one gram of water

Sodium hydroxide: 500ml × 10% = 50ml, 50ml × 1.1 = 55g
Water: 500ml × 1.1 = 550G, 550g-55g = 495G
So: water 495G, sodium hydroxide 55g

There are several alcohol solutions with 36% alcohol content. After adding a certain amount of water, dilute them to a solution with 30% alcohol content. If the solution is diluted to 24%, how many times of the water added last time?

Assuming that the 36% alcohol solution is 100 g, then the alcohol content is 100 × 36% = 36 (g); 36 △ 30% - 100 = 20 (g); (36 △ 24% - 100-20) △ 20, = 30 △ 20, = 1.5 times; a: the amount of water added is 1.5 times of that added last time

According to a certain law of the formula: 4 + 2, 5 + 8, 6 + 14, 7 + 20 So the 100th formula is______ ．

According to the above analysis, the 100th formula is: (4 + 99) + (2 + 99 × 6) = 103 + (2 + 594) = 103 + 596, so the answer is: 103 + 596

(1/a+1)-(a+3/a^2-1)*(a^2-2a+1/a^2+4a+3)

[1/(a+1)]-{(a+3)/[(a+1)(a-1)]}*{[(a-1)^2]/[(a+3)(a+4)}
=[1/(a+1)]-(a-1)/[(a+1)(a+4)]
=[(a+4)-(a-1)]/[(a+1)(a+4)]
5/[(a+1)(a+4)]

Mathematical problems (complete square formula)
(a-2b-c)²-(a+2b+c)²

[a - (2B + C)] ² - [a + (2B + C)] ² let 2B + C be y, we get (a-y) ² - (a + y) ² = (A & #178; - 2ay + Y & #178;) - (A & #178; + 2ay + Y & #178;) = - 4ay, substituting y = 2B + C, we get = - 4a (2B + C) = - 8ab-4ac

Given that the circle x2 + Y2 + 2x-4y + 1 = 0 is symmetric with respect to the line 2aX by + 2 = 0 (a, B ∈ R), then the value range of AB is ()
A. (−∞，14]B. [14，+∞)C. (−14，0)D. (0，14)

The equation of a circle is transformed into a standard equation, and the following results are obtained: (x + 1) 2 + (Y-2) 2 = 4, the coordinates of the center of the circle are (- 1, 2), and the radius r = 2. According to the meaning of the title, we can know that the center of the circle is on the known straight line 2ax-by + 2 = 0, and substituting the coordinates of the center of the circle into the straight line equation, we can get: - 2a-2b + 2 = 0, that is, B = 1-A, then let m = AB = a (1-A) = - A2 + A, when a = 1

Reflections on the flying of the gazelle

In the passage of the impala, human beings play an ignominious role as the invaders and predators of nature. We don't have to avoid this problem, because this article just gives us an opportunity to reflect on what human beings have done and put human beings in a correct position in nature. Human beings regard themselves as higher animals, and define themselves as "hominids", It is unique in this world and dominates the world. Human beings have strong thinking ability and advanced scientific and technological means, which can change the world. Therefore, we often mention a sentence: "conquer nature and transform nature." for other species living on this planet with ourselves, human beings are contemptuous. Human beings kill them wantonly, It has led to the extinction of many species. The tragic and tragic flight of the Impala shows us the sacred and inviolable spiritual power of animals. Reflecting on human society, when the disaster comes, how many of us can be as good as the impala, not harming people, not living, and treating death as returning home?

1. Group words ()
2. Supplementary idiom: introduce () ()
3. "Sometimes bending is not to yield and destroy, but to survive and develop better."

1. Dross words (dross)
2. Supplementary idiom: introduce (enter) (win)
3. "Sometimes bending is not to yield and destroy, but to survive and develop better."
In the face of difficulties and pressure, we should try our best to bear and overcome them. But when the difficulties hit you and you can't solve them, we should learn to give in. It doesn't mean timidity, but to accumulate strength