(a²一4a)²十8(a²一4a)十16

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(a²一4a)²十8(a²一4a)十16(a²一4a)²十8(a²一4a)十16(a²一4a)²十8(a²一4

(a²一4a)²十8(a²一4a)十16
(a²一4a)²十8(a²一4a)十16

(a²一4a)²十8(a²一4a)十16
=(a²-4a+4)²
=(a-2)的4次方