Analysis:

(1) First, make sure that the decimal point of the minuend is missing, and the decimal point of the minuend is not missing.

② So it should be: difference-difference (correct answer) = minuend-minuend with decimal point =25.65.

(3) Moving one place to the right means expanding 10 times, and if reducing 1 times, the minuend is 10 times.

Solution:

Let this number be x.

10X-X=25.65

9X=25.65

X=2.85

A: The original minuend should be 2.85.

Solution 2:

Move one place to the right, that is, expand 10 times.

Let the subtraction be 1 time, then the minuend is1time.

The formula is:

Original minuend = 25.65/(10-1) = 25.65/9 = 2.85.

A: The original minuend should be 2.85.

Solution 3:

Let the original minuend be x and the minuend be y,

Then the original difference = x-y;

Because the decimal point of the minuend is shifted to the right by one place, which is 10 times larger.

So now the minuend = 10x.

Then the current difference =10x-y;

Because the teacher said that his calculation difference was 25.65 larger than the correct result.

In other words, the current difference is 25.65 larger than the original difference.

So there is an equation:

( 10x-y)-(x-y)=25.65

9x=25.65

x=2.85

A: The original minuend should be 2.85.