因式分解 x*+10*+21-4y*-8y
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因式分解 x*+10*+21-4y*-8y
![因式分解 x*+10*+21-4y*-8y](/uploads/image/z/19836033-33-3.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3+x%2A%2B10%2A%2B21-4y%2A-8y)
x²+10x+21-4y²-8y
=x²+10x+25-4y²-8y-4
=(x+5)²-4(y+1)²
=[(x+5)+2(y+1)][(x+5)-2(y+1)]
=(x+2y+7)(x-2y+3)
=x²+10x+25-4y²-8y-4
=(x+5)²-4(y+1)²
=[(x+5)+2(y+1)][(x+5)-2(y+1)]
=(x+2y+7)(x-2y+3)