x²－y²＋2y－1因式分解！~

Question

大神啊！求解x²－y²＋2y－1因式分解！~

Answer 1

解：x²－y²＋2y－1=x²－(y²-2y+1)=x²－(y-1)²=(x+y-1)(x-y+1)本回答被提问者采纳