(x+2)(x+3)(x-4)(x-5)=144
[(x+2)(x-4)][(x+3)(x-5)]=144
(x²-2x-8)(x²-2x-15)=144
设x²-2x-8=y,则y(y-7)=144
即y²-7y-144=0
(y-16)(y+9)=0
∴y=16或y=9
当y=16时,x²-2x-8=16,即x²-2x-24=0,∴(x-6)(x+4)=0,∴x=6或x=-4
当y=9时,x²-2x-8=-9,即x²-2x+1=0,∴(x-1²=0,∴x=1
综上可得x=6或x=-4或x=1