题目内容
将多项式x2-4y2-9z2-12yz分解成因式的积,结果是 [ ]
A.(x+2y-3z)(x-2y-3z). B.(x-2y-3z)(x-2y+3z)
C.(x+2y+3z)(x+2y-3z). D.(x+2y+3z)(x-2y-3z)
D
.x2-4y2-9z2-12yz=x2-(4y2+12yz+9z2)=x2-(2y+3z)2
=[x+(2y+3z)][x-(2y+3z)]=(x+2y+3z)(x-2y-3z)∴选D.
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