How to show decimal on the matrix field?

How can i show decimal on matrix with text/numeric filed.

When i type 1.5, fiel stay empty but when i type 1 o 2 shown is done?

I'm afraid I failed to completely understand what you're trying to ask. Is this the form you're working on 70943638720864? 

I checked that and found an Input Table (Matrix Field) in it with a Numeric Textbox Input Type. It works as intended and accepts decimal places as shown below:

In case we misunderstood your question, just get back to us with a bit more info and a clearer description of what you're trying to do so we can better assist you.