-14xy-x²-49y² 3x³-12x²y+12xy²

来源：学生作业帮助网编辑：作业帮时间：2024/11/15 12:14:02

-14xy-x²-49y² 3x³-12x²y+12xy²
-14xy-x²-49y² 3x³-12x²y+12xy²

-14xy-x²-49y² 3x³-12x²y+12xy²
-14xy-x²-49y²
=-(x²+14xy+49y²)
=-(x+7y)²
3x³-12x²y+12xy²
=3x(x²-4xy+4y²)
=3x(x-2y)²