分式方程2x2-1+1=3x-1去分母后得到的方程是()
A.3x=0B.x2-3x-2=0C.x2-3x+4=0D.x2-2=0

答案如下:
方程两边乘x2-1,得
2+x2-1=3(x+1),
整理得x2-3x-2=0.
故选B.

相关问题推荐

  • “x与y的差”用代数式可以表示为▲.
    查看答案
  • 小明发现关于x的方程★x﹣6=9中的x的系数被污染了,要解方程怎么办?他翻开资料的答案一看,此方程的解为x=﹣3,则★是[]
    A.3B.﹣3C.5D.﹣5
    查看答案
  • 已知点A(a,-2),B(b,-4)在直线y=-x+6上,则a、b的大小关系是a______b.
    查看答案
  • 求.x5?.3yz=7850中的数字x、y、z.
    查看答案
  • 若x>y,则a2x()a2y。
    查看答案
  • 技术改造应遵循的原则有()。
    A.
    以内涵为主扩大再生产
    B.
    把提高企业经济效益和社会效益结合起来
    C.
    把技术先进性、生产适用性、经济合理性结合起来
    D.
    要依据科技进步定期进行
    查看答案
  • 9,26,51,124,173,( )

    A216B294C295D316
    查看答案
  • Effective tough survive wrap foremost refrain obtain distinguish existence available

    1 The theory supposes the ( ) of life on other planets .

    2 Would you please ( ) the toys up separately ?

    3 He built up a reputation as a ( ) businessman .

    4 There is no ( ) treatment of this disease .

    5 some rooms are ( ) to the doctors who are at the virus - control front line .

    6 The salesman finally managed to ( ) a copy of the report .

    7 It is hard to ( ) one twin from the other .

    8 Many companies managed to ( ) the pandemic .

    9 We have ( ) from going outside during the pandemic .

    10 This is first and ( ) a trade agreement.
    查看答案
  • 古典管理理论不相信管理是有规律可循的他们更相信个人经验
    查看答案
  • “战场”和“战士”这两个概念是()

    A.属种关系

    B.交叉关系

    C.全异关系
    查看答案