因式分解3(x-y)a³+27（y-x）×a

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因式分解3(x-y)a³+27（y-x）×a
因式分解3(x-y)a³+27（y-x）×a

因式分解3(x-y)a³+27（y-x）×a
3(x-y)a³+27（y-x）×a
=3(x-y)a³-27(x-y)×a
=3a(x-y)(a方-9)
=3a(x-y)(a+3)(a-3)