（x+2)(x+3)(x-4)(x-5)=144 [(x+2)(x-4)][(x+3)(x-5)]=144 (x^2-2x-8)(x^2-2x-15)=144 (x^2-2x)^2-23(x^2-2x)+120=144 (x^2-2x)^2-23(x^2-2x)-24=0 [(x^2-2x)-24][(x^2-2x)+1]=0 (x-6)(x+4)(x-1)^2=0 x1=6,x2=-4,x3=...