Notice that when you run:

var Ringo = new pol("Psyche Myche", 370, 1.7, 4000, 4200, 4600, 5000); 

you have added inputs into this pol constructor. By that logic, you also need to have parameters defined in the pol constructor like:

function pol (name, moc, square, A, B, C, D) {...}

As a side note, be careful about the line: var prices = pol.Ringo.price(); You define this.price as:

function(){
    if(wynik1 >18000){ return A;}
    if(wynik1 >10000){ return B;}
    if(wynik1 >5000){ return C;}
    if(wynik1>3000){ return D;}
})();

Those final parentheses are making this function return a value instead of setting this.price to a function. You'll notice I copied the syntax error (the single parenthesis after the close of the function) because that decides whether this will return a value or not. If you remove that one parenthesis, you also need to remove the () as well. Decide if this.price is supposed to be a function or a value. Based on the fact that you tried pol.Ringo.price(), you probably want it to instead be a function like (also note the added parameter of wynik1 (assuming you then call Ringo.price(some number)):

this.price = function(wynik1) {
    if(wynik1 >18000){ return A;}
    if(wynik1 >10000){ return B;}
    if(wynik1 >5000){ return C;}
    if(wynik1>3000){ return D;}
}; // no additional parentheses

The this.price function should also not be using A, B, C, and D. It should instead be accessing the specific values that are connected with a specific pol constructor: this.A, this.B, this.C, and this.D.

The final note is that the use of pol.Ringo.moc (or any of your other parameters will not work. Since pol is a constructor, when you create a new pol, there is no connection to the variable pol. Ringo will now point to different storage that has all of the information copied over, then set based on the parameters you get to new pol(...). You instead can access any of your new pol constructs just by using the variable name and doing something like:

var moc = Ringo.moc
var pow = Ringo.square
var prices = Ringo.price();

finally, with your help, I managed to fix it but I don't understand why it works.

var Ringo = new pol("Psyche", 370, 1.7, 4000, 4200, 4600, 5000); 
var prices = Ringo.price(4000, 4200, 4600, 5000);

in Ringo.price(); I can put any numbers and it works just like 1, 2, 3, 4 but if I put "a", "b", "c', "d" or empty do not. Why i can not just put there noting.