【正确答案】将会产生不超过5阶的互凋干扰的接收频率有：
   2f₁+f₂=2.583(MHz),f₁+2f₂=2.844(MHz),2f₁+2f₂=3.618(MHz),
   3f₁+f₂=3.357(MHz),f₁+3f₂=3.879(MHz),3f₁+2f₂=4.392(MHz),
   2f₁+3f₂=4.653(MHz),-f₁+3f₂=2.331(MHz),4f₁+f₂=4.131(MHz),
   4f₁-f₂=2.061(MHz)，f₁+4f₂=4.914(MHz),-f₁+4f₂=3.366(MHz),
  -2f₁+4f₂=2.592(MHz)