Under the action of load F1, the length of a string is L1 and that under F2, is L the original length of the wire is__________

  •   [L1F1 – L2F2] / [F1 + F2]
  • [L1F2 – L2F1] / [F1 – F2]
  • [L1F2 – L2F1] / [F2 – F1]
  • [L1F2 – L2F1] / [F1 + F2]
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