您好：（1）25x²-36=0 (5x+6)(5x-6)=0x1=-6/5x2=6/5（2）（x²-x）²-（x²-x）-2=0(x²-x-2)(x²-x+1)=0(x-2)(x+1)(x²-x+1)=0x1=2x2=-1不明白,可以追问如有帮助,记得采纳,谢谢 ...