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三道数学题,今晚就要1.(2a/a-1-a/a-1)/a2.(x/x-1-x/x^2-1)/x^2-x/x^2-2x+1

来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/18 13:01:40
三道数学题,今晚就要
1.(2a/a-1-a/a-1)/a
2.(x/x-1-x/x^2-1)/x^2-x/x^2-2x+1
3.(1-3/x+2)/x^2-1/x+2
三题都是化简,
三道数学题,今晚就要1.(2a/a-1-a/a-1)/a2.(x/x-1-x/x^2-1)/x^2-x/x^2-2x+1
1.(2a/a-1-a/a-1)/a=【(2a-a)/(a-1)】/a=1/(a-1)
2.(x/x-1-x/x^2-1)/x^2-x/x^2-2x+1
  =[(x+1)x-x)(x-1)²]/[(x²-1)(x²-x)]
  =x²(x-1)²/[x(x-1)²(x+1)]
  =x/(x+1)
  3.(1-3/x+2)/x^2-1/x+2
  =(x+2-3)/(x²-1)
  =(x-1)/(x-1)(x+1)
  =1/(x+1)