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Hello Haskell is a functional language and has the option to define functions in prefix or infix notation, while that the hp-prime only prefix notation

PREFIX means the function name is before of the arguments

Example in prefix notation:
FUCTIONAME (arg1, arg2, argN) := expresion

ADDITION (X, Y) := X + Y // definition
ADDITION (3, 4)
returns 7

Infix means that the function name is between the arguments

Example:
  arg1 FUCTIONAME arg2
  X ADDITION Y: = X + Y

To denote that a function is in infix, HASKELL LANGUAGE use quotes inclined to the left ``
X `ADDITION` Y: = X + Y // definition
3 ADDITION 4
returns 7

This and similar to MODULO function

23 MOD 5
returns 3

For n arguments groups in parenthesis

(Arg1, arg2, argn) `FUCTIONAME` (arg1, arg2, argn) := ...
 



I think that the HP48 / 50 in SYSPRL can create this kind of infix functions,

can incorporate it into xcas?

the purpose is to create and writing functions nearest to math textbooks

This is supported in Giac/Xcas but not on the Prime, for example :

Xcas is great =), we need a "HP-Prime xcas"

and, what is the syntax for n arguments?

It works only for unary/binary.