X^2-5x=3,(x-1)(2x-1)-(X+1)^2+1=2x^2-3x+1-x^2-2x-1+1=x^2-5x+1=3+1=4祝学习进步
(x-1)(2x-1)-(X+1)^2+1=2x^2-x-2x+1-x^2-2x-1+1=X^2-5x+1X^2-5x=3故(x-1)(2x-1)-(X+1)^2+1=4
x²-5x=3(x-1)(2x-1)-(X+1)^2+1=2x²-3x+1-x²-2x-1+1=x²-5x+1=3+1=4