因式分解:3x²+12x-5x²-6x-7x²+6x-7
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![因式分解:3x²+12x-5x²-6x-7x²+6x-7](/uploads/image/z/264271-31-1.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A3x%26%23178%3B%2B12x-5x%26%23178%3B-6x-7x%26%23178%3B%2B6x-7)
因式分解:3x²+12x-5x²-6x-7x²+6x-7
因式分解:3x²+12x-5
x²-6x-7
x²+6x-7
因式分解:3x²+12x-5x²-6x-7x²+6x-7
3x²+12x-5 没法进行通常的因式分解,因为3x²+12x-5=0的解是一对无理数x=-2±√51/3,分解的结果是3x²+12x-5=3(x+2+√51/3)(x+2-√51/3)
x²-6x-7=(x-7)(x+1)
x²+6x-7=(x+7)(x-1)
(x-6)(x+1)
3x²+12x-5 = (3X - 1)*(X + 5 )
x²-6x-7 = (X - 7)*(X + 1)