解分式方程: (2/X-3)—(2/X-4)=(2/X-5)—(2/X-6)怎么做?(具体过程)
问题描述:
解分式方程: (2/X-3)—(2/X-4)=(2/X-5)—(2/X-6)怎么做?(具体过程)
答
2/(X-3) -2/(X-4) = 2/(X-5) - 2/(X-6)
首先: (X-3) ≠0 , (X-4)≠0 , (X-5)≠0 ,(X-6) ≠0
1/(X-3) -1/(X-4) = 1/(X-5) - 1/(X-6)
{ (x-4)-(x-3) } / { (X-3)(X-4) } = { (x-6)-(x-5) } / { (X-5)(X-6) }
-1 / { (X-3)(X-4) } = -1 / { (X-5)(X-6) }
(X-3)(X-4) = (X-5)(X-6)
x^2-7x+12=x^2-11x+30
4x=18
x=9/2
答
先化简下:-2/(x-3)(x-4)=-2/(x-5)(x-6)两边同乘 (x-3)(x-4)(x-5)(x-6)-2(x-5)(x-6)=-2(x-3)(x-4)-2(x^2-11x+30)=-2(x^2-7x+12)-2x^2+22x-60=-2x^2+14x-24x=4.5检验:把x=4.5代入得(x-3)(x-4)(x-5)(x-6)≠0∴x=4.5是...