25x²-36=025x²=36x² =36/25x=±6/5=±1.2追问(x²-x)²-(x²-x)-2＝0(x²-x+1)(x²-x-2)=0(x²-x+1)(x+1)(x-2)=0∵x²-x+1≠0∴x+1=0、x-2=0∴x₁=-1、x₂=2...