text: 
  var multF = require('./mult')
  var divF = require('./div')
  var somaF = require('./soma')
  var subF = require('./sub')
  
  console.log(somaF(1,2))
  console.log(multF(1,2))
  console.log(divF(1,2))
  console.log(subF(1,2))