Question

2x+1/x-4=2x+1/x-5 方程 等于多少

Answer 1

2x+1/x-4=2x+1/x-5

2x+1/x-4-2x+1/x-5=0

(2x+1)( 1/x-4-1/x-5)=0

(2x+1)(x-5-x+4/(x-4)(x-5))=0

(2x+1)(-1/(x-4)(x-5))=0

2x+1=0 (-1/(x-4)(x-5))=0

x=-1/2 或x=4(增根）x=5(增根）