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The process of proving the formula of 2 times 2 inverse matrix algorithm A = ad-bc of D B = - ad-bc of B C = - ad-bc of C D = ad-bc of a,
The definition is written directly
A^(-1)=A*/IAI
The second one was written directly
How many ways to find the inverse matrix?
In general, there are two methods. 1. Adjoint matrix method. The inverse matrix of a = the adjoint matrix of a / the determinant of A. 2. Elementary transformation method. A and the identity matrix carry out elementary row (or column) transformation at the same time. When a becomes the identity matrix, the identity matrix becomes the inverse matrix of A
Point to the rainbow
Point to the rainbow
A rainbow
she needs to win this point to level the scores
She needs to win this point to level the scores?
She needs to win the point to reach the grade
English translation
I see such a sentence: it is difficult to the point of impossibility for the average reader to image
Achieve The extent of
To degree
To the point of
What do you mean you are to the point?
What you said is quite right
Or:
You are to the point
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