2-x/x-3整体+1/3-x=3(2)5x-4/2x-4=2x+5/3x-6整体-0.5解方程

问题描述:

2-x/x-3整体+1/3-x=3(2)5x-4/2x-4=2x+5/3x-6整体-0.5解方程

1.
(2-x)/(x-3)+1/(3-x)=3
(2-x)/(x-3)-1/(x-3)=3
(2-x)-1=3(x-3)
2-x-1=3x-9
1-x=3x-9
1-x-3x+9=0
-4x+10=0
x=5/2
2.
(5x-4)/(2x-4)=(2x+5)/(3x-6)-0.5
(5x-4)/2(x-2)=(2x+5)/3(x-2)-0.5
3(5x-4)=2(2x+5)-0.5*6(x-2)
15x-12=4x+10-3x+6
15x-12=x+16
15x-12-x-16=0
14x-28=0
x=2
因为x=2时,方程分母为零,所以x=2是增根。

(2-x)/(x-3)+1/(3-x)=3(2-x)/(x-3)-1/(x-3)=3(2-x-1)/(x-3)=31-x=3x-94x=10x=2.5(5x-4)/(2x-4)=(2x+5)/(3x-6)-0.53(5x-4)/(6x-12)=2(2x+5)/(6x-12)-33(5x-4)/(6x-12)-2(2x+5)/(6x-12)+...