因式分解:(1)3分之1x²y-3y (2)-4(x-2y)²+9(x+y)²
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 02:24:10
![因式分解:(1)3分之1x²y-3y (2)-4(x-2y)²+9(x+y)²](/uploads/image/z/744967-55-7.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A%281%293%E5%88%86%E4%B9%8B1x%26%23178%3By-3y+%282%29-4%EF%BC%88x-2y%EF%BC%89%26%23178%3B%2B9%EF%BC%88x%2By%EF%BC%89%26%23178%3B)
因式分解:(1)3分之1x²y-3y (2)-4(x-2y)²+9(x+y)²
因式分解:(1)3分之1x²y-3y (2)-4(x-2y)²+9(x+y)²
因式分解:(1)3分之1x²y-3y (2)-4(x-2y)²+9(x+y)²
:(1)3分之1x²y-3y
=y/3(x²-9)
=y/3(x+3)(x-3)
(2)-4(x-2y)²+9(x+y)²
=9(x+y)²-4(x-2y)²
=(3x+3y+2x-4y)(3x+3y-2x+4y)
=(5x-y)(x+7y)