用换元法解方程:x2-x+1=6/x2−x.
问题描述:
用换元法解方程:x2-x+1=
. 6
x2−x
答
设x2-x=y,则1x2−x=1y,原方程化为y+1=6y,∴y2+y-6=0即(y+3)(y-2)=0,解得y1=-3,y2=2.当y=-3时,x2-x=-3,∴x2-x+3=0,∵△=1-12<0,∴此方程无实根;当y=2时,x2-x=2,∴x2-x-2=0,解得x1=-1,x2=2.经检...