27(x-y)²[-2/9(y-x)四次方]

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27(x-y)²[-2/9(y-x)四次方]

27(x-y)²[-2/9(y-x)四次方]
27(x-y)²[-2/9(y-x)四次方]

27(x-y)²[-2/9(y-x)四次方]

27(x-y)²[-2/9(y-x)四次方]
=-6(x-y)²(x-y)的4次方
=-6(x-y)的6次方
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