1)【(a+1)/(a²-a)+4/(1-a²)】÷(a-1)=2)【a-(a²-b²+1)/a】÷【(b-1)/a】×【1/(a+b)】=3)(2x²-6x)/(x²-9)-(x+3)/(3-x)-(2x+6)/(x²+6x+9)=3

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/19 01:54:13
1)【(a+1)/(a²-a)+4/(1-a²)】÷(a-1)=2)【a-(a²-b²+1)/a】÷【(b-1)/a】×【1/(a+b)】=3)(2x²-6x)/(x²-9)-(x+3)/(3-x)-(2x+6)/(x²+6x+9)=3
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1)【(a+1)/(a²-a)+4/(1-a²)】÷(a-1)=2)【a-(a²-b²+1)/a】÷【(b-1)/a】×【1/(a+b)】=3)(2x²-6x)/(x²-9)-(x+3)/(3-x)-(2x+6)/(x²+6x+9)=3
1)【(a+1)/(a²-a)+4/(1-a²)】÷(a-1)=
2)【a-(a²-b²+1)/a】÷【(b-1)/a】×【1/(a+b)】=
3)(2x²-6x)/(x²-9)-(x+3)/(3-x)-(2x+6)/(x²+6x+9)=3

1)【(a+1)/(a²-a)+4/(1-a²)】÷(a-1)=2)【a-(a²-b²+1)/a】÷【(b-1)/a】×【1/(a+b)】=3)(2x²-6x)/(x²-9)-(x+3)/(3-x)-(2x+6)/(x²+6x+9)=3
1)【(a+1)/(a²-a)+4/(1-a²)】÷(a-1)
  =[a﹙a+1﹚﹙a-1﹚-4﹙a+1﹚﹙a-1﹚]÷(a-1)
  =a﹙a+1﹚-4﹙a+1﹚
  =a²+a-4a-4
  =a²-3a-4
2)【a-(a²-b²+1)/a】÷【(b-1)/a】×【1/(a+b)】
  =[﹙a²-a²+b²-1﹚/a]×[a/﹙b-1﹚]×[1/﹙a+b﹚]
  =[﹙b+1﹚﹙b-1﹚﹚/a]×[a/﹙b-1﹚]×[1/﹙a+b﹚]
  =﹙b+1﹚/﹙a+b﹚
3)(2x²-6x)/(x²-9)-(x+3)/(3-x)-(2x+6)/(x²+6x+9)
  =[2x﹙x-3﹚/﹙x-3﹚﹙x+3﹚]+﹙x+3﹚/﹙x-3﹚-2﹙x+3﹚/﹙x+3﹚³
  =2x/﹙x+3﹚-2/﹙x+3﹚+﹙x+3﹚/﹙x-3﹚
  =﹙2x-2﹚/﹙x+3﹚+﹙x+3﹚/﹙x-3﹚
  =﹙2x-2﹚﹙x-3﹚+﹙x+3﹚²/﹙x+3﹚﹙x-3﹚
  =﹙3x²-2x+15﹚/﹙x+3﹚﹙x-3﹚

先对一下答案,不一样的追问过程吧

1)【(a+1)/(a²-a)+4/(1-a²)】÷(a-1)=
=1/(a²+a)
2)【a-(a²-b²+1)/a】÷【(b-1)/a】×【1/(a+b)】
=(b-a)/(b-1)
3)(2x²-6x)/(x²-9)-(x+3)/(3-x...

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先对一下答案,不一样的追问过程吧

1)【(a+1)/(a²-a)+4/(1-a²)】÷(a-1)=
=1/(a²+a)
2)【a-(a²-b²+1)/a】÷【(b-1)/a】×【1/(a+b)】
=(b-a)/(b-1)
3)(2x²-6x)/(x²-9)-(x+3)/(3-x)-(2x+6)/(x²+6x+9)=3
2x(x-3)/(x+3)(x-3)+(x+3)/(x-3)-2(x+3)/(x+3)²=3
2x(x-3)/(x+3)(x-3)+(x+3)/(x-3)-2/(x+3)=3
两边乘以(x+3)(x-3)得
2x(x-3)+(x+3)²-2(x-3)=3(x+3)(x-3)
2x²-6x+x²+6x+9-2x+6=3x²-27
-2x=-42
x=21
检验:x=21是方程的解

收起

【(a+1)/(a²-a)+4/(1-a²)】÷(a-1)
=【(a+1)²/a(a²-1)-4a/a(a²-1)】÷(a-1)
=【(a-1)²/a(a²-1)】÷(a-1)
=【(a-1)/a(a²-1)】
=1/[a(a+1)]
【a-(a²-b...

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【(a+1)/(a²-a)+4/(1-a²)】÷(a-1)
=【(a+1)²/a(a²-1)-4a/a(a²-1)】÷(a-1)
=【(a-1)²/a(a²-1)】÷(a-1)
=【(a-1)/a(a²-1)】
=1/[a(a+1)]
【a-(a²-b²+1)/a】÷【(b-1)/a】×【1/(a+b)】
=【[a²-(a²-b²+1)]/a】 × 【a/(b-1)】×【1/(a+b)】
=【(b²-1)/a】 × 【a/(b-1)】×【1/(a+b)】
=(b+1)/(a+b)
(2x²-6x)/(x²-9)-(x+3)/(3-x)-(2x+6)/(x²+6x+9)=3
左边=2x(x-3)/(x²-9)+(x+3)/(x-3)-2(x+3)/(x+3)²
=2x/(x+3)+(x+3)/(x-3)-2/(x+3)
=[2x(x-3)+(x+3)²-2(x-3)]/(x²-9)
=(2x²-6x+x²+6x+9-2x+6)
=(3x²-2x+15)/(x²-9)
=右边=3
3x²-2x+15=3(x²-9)
2x=42
x=21

收起

(a+1)/(a+a)(a-1)+4 /(1-a)(a+1)/(a-1)=4a+4/(1-a)(a+1)=a(a+1)/(1-a)(a+1)=a/1-a

  1. 1/a²+a

  2. (b+1)(a+b)

  3. 等一下再算