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已知a/(x2)与b/(x-2)的和等于4x/(x^2-4),则?

2005-04-12 19:44:46l***
已知a/(x+2)与b/(x-2)的和等于4x/(x^2-4),则a= , b= 已知a/(x2)与b/(x-2)的和等于4x/(x^2-4),则a=,b=已知a/(x+2)与b/(x-2)的和等于4x/(x^2-4),则a=,b=:a/(x?

最佳回答

  • a/(x+2)+b/(x-2)=[(a+b)x+2(b-a)]/(x^2-4)=4x/(x^2-4) 所以a+b=4,a-b=0 则a=b=2
    2005-04-12 19:52:52
  • 很赞哦! (35)