Block method for matrix multiplication 2 1 0 1 0 1 A=0 2 1 0 0 3 1 2 1 0 B= -1 0 0 1 0 -1 0 0 Find ab

Block method for matrix multiplication 2 1 0 1 0 1 A=0 2 1 0 0 3 1 2 1 0 B= -1 0 0 1 0 -1 0 0 Find ab

AB=
3 4 2 1
1 1 1 0
2 -1 0 2
0 -3 0 0

Right hand spiral law?

The content of the right hand rule is: extend the right hand so that the thumb is perpendicular to the other four fingers and in the same plane with the palm, put the right hand into the magnetic field, let the magnetic line penetrate into the palm vertically, and the thumb points to the direction of the conductor movement, Then the other four fingers point to the direction of motional electromotive force. The direction of motional electromotive force is the same as that of induced current
The direction of motional electromotive force determined by the right hand rule accords with the law of energy conversion and conservation
Notes on Application of right hand rule
1. When applying the right hand rule, it should be noted that the object is a straight wire, and the velocity V and magnetic field B should be perpendicular to the wire, and V and B should also be perpendicular,
2. The right hand rule cannot be used to judge the direction of induced electromotive force
Lenz's law
The law for determining the direction of induced electromotive force (induced current)
The content of the law is generally expressed as follows: the direction of the induced current (induced electromotive force) in a closed circuit always causes the magnetic field generated by it to hinder the change of the magnetic flux causing the induced current (induced electromotive force). When the magnetic flux passing through the circuit increases, the magnetic field of the induced current is opposite to the original magnetic field; when the magnetic flux passing through the circuit decreases, the magnetic field of the induced current is opposite to the original magnetic field, The magnetic field of induced current has the same direction as the original magnetic field, The direction of induced current determined by Lenz's law always hinders relative motion. We can express Lenz's law as follows: the effect of induced current always resists the cause of induced current. This expression is more convenient for some problems. Lenz's law conforms to the law of energy conversion and conservation
The difference and connection between Lenz's law and right hand rule
Lenz's law is a general law to determine the direction of induced electromotive force (induced current). The object of Lenz's law is a closed loop, which is applicable to all electromagnetic induction phenomena. The object of right-hand rule is a straight wire, which is only applicable to the movement of magnetic induction wire when the wire is cut. The right-hand rule can be regarded as a special case of Lenz's law

What can be factorized by the square difference formula in the following formulas
1.9x^2+4y^2
2.9x^2+(-4y)^2
3.-9x^2-4y^2
4.-9x^+4y^2

4

If the image of a linear function y = 3x-2 and y = - x + m intersects at a point on the x-axis, then M=

X = (y + 2) / 3 and x = m-y. intersect on the x-axis, so, (y + 2) / 3 = M-Y gets 4Y = 3m-2. Intersect on the x-axis, so y = 0, so m = 2 / 3

2 (2x-3y) - (3x + 2Y + 1), where x = 2, y = - 0.5, first bring in the letters, and then bring in the numbers when the reduction is too late

2（2x-3y）-（3x+2y+1）
=4x-6y-3x-2y-1
=x-8y-1
x=2,y=-0.5
2-8×(-0.5)-1
=2-(-4)-1
=2+4-1
=5

Parabolic problem of quadratic function in junior three mathematics. (process)
It is known that the shape of parabola y = ax ^ 2 + BX + C is the same as that of parabola y = 1 / 4 x ^ 2, the opening direction is opposite, and when x = 2, the function has the maximum value of 4, so we need to find it
(1) The analytic formula of parabola
(2) When x takes what value, y decreases with the increase of X
Wrong, when x = - 2.

(1) Because: the shape of parabola y = ax & sup2; + BX + C is the same as parabola y = (1 / 4) x & sup2; and the opening direction is opposite. So: a = - 1 / 4, and because when x = 2, the function has the maximum value. So: the symmetry axis of the function x = - B / 2A = 2, that is - B / [2 * (- 1 / 4)] = 2, so: B = 1, coordinate (2,4), a = - 1 / 4, B = 1

Is there only one common solution for a system of linear equations of two variables

Pro, yes! There is only one public solution
I hope my answer can help you and give you a good comment!

What is the slope of the line between each point on the I-U line and the origin of the coordinate
A linear element is the one with a straight line

Maybe it's the reciprocal=

Factorization of the following formula: 64 (a + b) ^ 2-36 (a-b) ^ 2 =? There must be a process

64(a+b)^2-36(a-b)^2
=[8(a+b)]^2-[6(a-b)]^2
=[8(a+b)-6(a-b)]*[8(a+b)+6(a-b)]
=(2a+14b)(14a+2b)
=4(a+7b)(7a+b)

1. Xiaoming's mother deposits 4000 yuan in the bank for one year, with an annual interest rate of 2.25%, according to the regulations of the bank
If not, the principal and interest will continue to be calculated at the monthly interest rate of 0.06%. After 10 months, how much can Xiao Ming's mother withdraw?
2. A fruit merchant wholesales 150 kg of oranges for 150 yuan, and the price is 2.5 yuan. 60% of the oranges are sold at a certain price, 25% are sold at a 60% discount, and the remaining oranges are rotten. Did the fruit merchant make a profit or lose? What is the profit rate or loss rate?
It should be written according to the specific process

Do you want to take an exam? Question 1, 4000 * 2.25% + 4000 + 4000 * 0.06% * 10, the bank is simple interest calculation
Question 2: the price of oranges sold at a fixed price is 2.5 * 150 * 0.6, and the price of oranges sold at a discount of 6% is 25% * 2.5 * 150 * 0.6. As for the profit and loss ratio, it's simpler. The profit and loss ratio is the same as the total price, and the loss ratio is the same as the loss ratio
What grade are you in? Is it the teacher's winter vacation homework?
Happy Spring Festival!