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Is there any formula for matrix (AB)^T= (A+B)^T= (AB)^-1= (A+B)^-1= (AB)*= (A+B)*=
(AB)^T=B^TA^T (A+B)^T=A^T+B^T
(AB)^-1=B^-1A^-1
(AB)*=B*A*
Nothing else
The problem of matrix formula
If we know a C and ab = C, isn't it always wrong to find a transpose matrix where B is multiplied by a on both sides
Both take a ^ - 1
It should be noted that all must be multiplied on the left (for example, AB and Ba are different)
If this place is right, it can only be a miscalculation, including a ^ - 1 miscalculation or a miscalculation when multiplying it
How many square decimeters is one square kilometer
1 square kilometer = 10000000 square meters = 100000000 square decimeters
The area of the right angle trapezoid in the figure is 60 square centimeters, the sum of the upper and lower bottom is 20 centimeters, and the ratio of the two waists is 3:5
Two radius is subtracted from the bottom of the ladder, two radius is subtracted from the bottom of the two radius, and the remaining part is about a centimet, and the radius of the fan is about a centimet, and the radius of the fan is about a centimet, and the radius of the fan is about a centimet, and the radius of the fan is about a centimet; (2R + 2R + 2R (2R + 2R + a) × 2R (2R + 2R + + a) × 2R ((2R + 2R + 2R + + + a))))) × 2R \\\\\\\\\\\\\\\\\\\\\\\\\\sp; R = 3, s yin = 60-32, π = 31.74 (square centimeter); a: the area of shadow is 31.74 square centimeter
If it is known that the perimeter of the triangle connecting the midpoint of each side is 10 cm, then the perimeter of the original triangle is 10 cm______ cm．
As shown in the figure: ∵ D, e and F are respectively the midpoint of AB, AC and BC sides of △ ABC, ∵ de = 12ac, EF = 12ab, DF = 12bc, ∵ de + EF + DF = 12 (AB + BC + CD), that is, AB + BC + CD = 2 (de + EF + DF) = 2 × 10 = 20
If | 2a-1 | and (B + 2) 2 are opposite numbers, then the value of AB is______ ．
∫|2a-1|and (B + 2) 2 are opposite to each other, where |2a-1|+ (B + 2) 2 = 0, ∫ 2a-1 = 0, a = 12; (B + 2) 2 = 0, B = - 2; then AB = 12 × (- 2) = - 1
In the crazy guess idiom, there is a wolf barking at a ghost and a big moon behind it. What idiom is this
Ghosts cry and wolves howl~
Science problems in grade three
In order to prove to his classmates that "when sound propagates in the air, it depends on the vibration of the air", a student designed the following four experiments, which is the most reasonable? (answer B, I think it is d)
A. Knock on one end of the long steel pipe, and you can hear twice at the other end
B. When you hit the drum with a hammer to make a sound, you can see the paper on the drum beating
C. Lead the other students to the vicinity of the jet Airport To observe the vibration of the window
D. Let the students hold the iron piece, ruler and other objects in their hands, and put the side of them close to the speaker of the sound recorder to feel the vibration of their hands
I think it's D, too
If 2x ^ 2-x ^ 2-13x + K decomposes a factor into (2x + 1), find the value of K and decompose the factor
I'm glad to help you
After simplification = x ^ 2-13x + k
Let the factorization be (2x + 1) * (1 / 2x-a)
Then x ^ 2-2ax + 1 / 2x-a = x ^ 2-13x + k
Then 2a-1 / 2 = 13
A=-K
So k = - a = - 27 / 4
1/2(2X+1)(X+27/2)、
On the right is the plan of the swimming pool of Zhongshan primary school. If the swimming pool is 50 meters long and 30 meters wide, measure the required data and calculate the scale of the map
The picture is 2.5cm long and 1.5cm wide
Scale = 2.5cm: 50m = 2.5cm: 5000cm = 5cm: 10000cm = 1:2000
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