x[x-1]-3x+4
问题描述:
x[x-1]-3x+4
答
x[x-1]-3x+4
=x²-x-3x+4
=x²-4x+4
=(x-2)²
x[x-1]-3x+4
x[x-1]-3x+4
=x²-x-3x+4
=x²-4x+4
=(x-2)²