The answer greatly simplifies the steps of doing the problem and makes you unable to understand it. I used to be a candidate in Tianjin, and the answer to the senior high school entrance examination is so simple that it is impossible to simplify it.

Two methods

One method directly uses the distance formula from point to straight line. I forgot the specific formula. If you haven't learned this formula yet, look at the second method.

The second method: in fact, it is stare blankly calculation. Let the straight line perpendicular to the straight line Y=X passing through point M be Y=X+b, calculate b=t+T, find the intersection of y=x+T+t and Y=X ((T+t)/2, (T+t)/2), and calculate this point with (t, t).

When writing standard answers to test papers, I always like to omit such steps and draw conclusions directly from the questions. In fact, they are all calculated, and so are the standard answers of the college entrance examination. I am speechless.

Graphic? ! This is a bit difficult. I don't have a camera. How can I give you a chart? !

I have given you a solution to the problem. If you have any questions, please ask again.