来源:学生作业帮 编辑:百度作业网作业帮 分类:数学作业 时间:2024/08/17 22:04:29
解方程化简
![](http://img.wesiedu.com/upload/b/66/b660050831d4930cf336dcdae5f5cfef.jpg)
3.乘以(x+1)(x-1)得
x(x+1)-3(x-1)=(x+1)(x-1)
x^2+x-3x+3=x^2-1
x-3x=-1-3
-2x=-4
x=2
经检验x=2是原方程的解
4.原式=(a-3)/[3a(a-2)]÷[(a+2)(a-2)-5]/(a-2)
=(a-3)/[3a(a-2)]÷[(a+3)(a-3)]/(a-2)
=(a-3)/[3a(a-2)]×(a-2)/[(a+3)(a-3)]
=1/[3a(a+3)]
=1/(3a^2+9a)