9y2-4x2-4x-1因式分解为
问题描述:
9y2-4x2-4x-1因式分解为
答
9y²-4x²-4x-1
=9y²-(4x²+4x+1)
=9y²-(2x+1)²
=(3y+2x+1)(3y-2x-1)
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