如何因式分解3x*2-10xy 3y*2 9x 5y-12
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如何因式分解3x*2-10xy 3y*2 9x 5y-12
![如何因式分解3x*2-10xy 3y*2 9x 5y-12](/uploads/image/z/19460292-60-2.jpg?t=%E5%A6%82%E4%BD%95%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A33x%2A2-10xy+3y%2A2+9x+5y-12)
3x*2-10xy+3y*2+9x+5y-12
=(3x-y)(x-3y)+12x-4y-3x+9y-12
=(3x-y)(x-3y)+4(3x-y)-3x+9y-12
=(3x-y)(x-3y+4)-3(x-3y+4)
=(x-3y+4)(3x-y-3)
=(3x-y)(x-3y)+12x-4y-3x+9y-12
=(3x-y)(x-3y)+4(3x-y)-3x+9y-12
=(3x-y)(x-3y+4)-3(x-3y+4)
=(x-3y+4)(3x-y-3)