16x^2-4y^2-9z^2+12yz
1个回答
16x^2-4y^2-9z^2+12yz
=16x^2-(4y^2+9z^2-12yz)
=16x^2-(2y-3z)^2
=(4x+2y-3z)(4x-2y+3z)
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