解下列方程..

题目

解下列方程..
1.(x/x-5)=(x-2)/(x-3)
2.(6x-1)/(3x+2)=(4x-7)/(2x-5)
3.{1/(x^2+5x+6)}={1/(x+2)}+{1/(x+3)}
4.解关于x的方程{(a+b)/x}+(a/b)=-1(a+b≠0)
5.解方程{[1/(x-5)]+[1/(x-9)]}={[1/(x-8)]+[1/(x-6)]}

答案

1.(x/x-5)=(x-2)/(x-3) x(x-3)=(x-2)(x-5)x^2-3x=x^2-7x+104x=10x=5/22.(6x-1)/(3x+2)=(4x-7)/(2x-5) (6x-1)(2x-5)=(4x-7)(3x+2)12x^2-32x+5=12x^2-13x-1419x=19x=13.{1/(x^2+5x+6)}={1/(x+2)}+{1/(x+3)} {1/(x+2)(x...