4x^2-2x+5=74x^2-2x=22x^2-x=12x^2-x+1=1+1=2
4x^2-2x+5的值为74x²-2x=22x²－x=12x^2-x+1=1+1=2
4x^2-2x+5的值为74x^2-2x=22x^2-x=12x^2-x+1=2
