(x²-2x)²+2x²-4x+1系数的次方是2

问题描述:

(x²-2x)²+2x²-4x+1
系数的次方是2

(x²-2x+1)²

(x²-2x)²+2(x²-2x)+1
=(x²-2x+1)²
=(x-1)^4