x²-Y²-x-5y-6分解因式很清晰了
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![x²-Y²-x-5y-6分解因式很清晰了](/uploads/image/z/5435510-14-0.jpg?t=x%26%23178%3B-Y%26%23178%3B-x-5y-6%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%E5%BE%88%E6%B8%85%E6%99%B0%E4%BA%86)
x²-Y²-x-5y-6分解因式很清晰了
x²-Y²-x-5y-6分解因式
很清晰了
x²-Y²-x-5y-6分解因式很清晰了
原式=x²-Y²-x-5y-6
=(x²-x+1/4)-(Y²+5y+25/4)
=(x-1/2)²-(Y+5/2)²
=[(x-1/2)+(Y+5/2)][(x-1/2)-(Y+5/2)]
=(x+Y+2)(x-Y-3)
x²-Y²-x-5y-6
=(x+y)(x-y)-x-5y-6
=(x+y+2)(x-y-3)
十字相乘
x+y 2
x-y ﹣3