(a +2b)(a-2b)-1/2(a-8b)偶求你们了!快

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(a +2b)(a-2b)-1/2(a-8b)偶求你们了!快
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(a +2b)(a-2b)-1/2(a-8b)偶求你们了!快
(a +2b)(a-2b)-1/2(a-8b)
偶求你们了!快

(a +2b)(a-2b)-1/2(a-8b)偶求你们了!快
(a +2b)(a-2b)-1/2(a-8b)
=a^2-4b^2-(1/2)a+4b