"Innovation and Successful Learning of Mathematics in the Third Grade of Primary School" Exercise: Which sum of four numbers is equal to their product? Ask the experts to help!

The title of this question does not limit what the four numbers are, but gives a relatively broad condition:

The sum of four numbers is equal to their product, that is, A+B+C+D = A * B * C * D.

Then these four numbers are likely to have some special numbers.

As we know, 0 plus any number equals that number itself, and multiplying it by any number is 0.

Suppose one of them is the number 0, then we can directly get the following formula:

0+b+c+d=0

Then the three numbers b, c, d, c and d can satisfy the following conditions: b+c+d=0.

b=-c-d

That is, the values of b and c+d are reciprocal.

So you can get a lot of these four numbers,

Such as 0,-1, -2, 3.

0,-9,- 18,27

I hope I can help you!