The usual F # style is for defining functions performed in curry, i.e. not alternating according to your first example.
Currying allows you to do this: ("partial application")
let myfunc par1 par2 = ...
let myfuncHello = myfunc "Hello"
myfuncHello "World" // same as: myfunc "Hello" "World"
, .NET, F #, tupling, , F #.
: F # Snippets: http://fssnip.net/I