解(x-5)(x+3)=1x²-2x-15=1x²-2x=16x²-2x+1=17(x-1)²=17∴x-1=√17或x-1=-√17∴x=1+√17或x=1-√17(x+2)(x-2)+4(x+3)=13x²-4+4x+12=13x²+4x-5=0(x+5)(x-1)=0x=-5或x=1