-49x²+14x-1+y²

来源：学生作业帮助网编辑：六六作业网时间：2024/12/22 10:17:40

-49x²+14x-1+y²-49x²+14x-1+y²-49x²+14x-1+y²原式=y²-(49x²-14x+1)

-49x²+14x-1+y²
-49x²+14x-1+y²

-49x²+14x-1+y²
原式=y²-(49x²-14x+1)
=y²-(7x-1)²
=(y+7x-1)(y-7x+1)

-49x²+14x-1+y²
=y²-(7x-1)²
=(y+7x-1)(y-7x+1)