分式方程练习题。

来源:百度知道 编辑:UC知道 时间:2024/05/31 09:43:44
1.(2x分之3) + 2 = 0

2.(x-1分之x) + (x+1分之2) =1

3.(x+1分之1) - (x²+3x+2分之x²)=-1

3/2x=-2
3=-4x
x=-3/4

x/(x-1)+2/(x+1)=1
x(x+1)+2(x-1)=(x-1)(x+1)
x^2+x+2x-2=x^2-1
3x=1
x=1/3

1/(x+1)-x^2/(x^2+3x+2)=-1
1/(x+1)-x^2/(x+1)(x+2)=-1
(x+2)/(x+1)(x+2)-x^2(x+1)(x+2)=-1
x+2-x^2=-(x+1)(x+2)
x^2-x-2=x^2+3x+2
4x=-4
x=-1

1、3/(2x)+2=0
3+4x=0
x=-3/4

2、x/(x-1)+2/(x+1)=1
两边同乘以(x+1)(x-1)
x(x+1)+2(x-1)=(x+1)(x-1)
x=1/3

3、1/(x+1)-x²/(x²+3x+2)=-1
两边同乘以(x²+3x+2)
x+2-x²+x²+3x+2=0
x=-1

1,3/(2x)=-2
2x=-3/2
x=-3/4
2,x(x+1)+2(x-1)=(x-1)(x+1)
3,x²+3x+2-x²(x+1)=-(x²+3x+2)(x+1)