(a-1/2)(a+1/2)(a的平方+1/4)

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(a-1/2)(a+1/2)(a的平方+1/4)(a-1/2)(a+1/2)(a的平方+1/4)(a-1/2)(a+1/2)(a的平方+1/4)答案是:a^4-1/8=(a^2-1/4)(a^2+1/

(a-1/2)(a+1/2)(a的平方+1/4)
(a-1/2)(a+1/2)(a的平方+1/4)

(a-1/2)(a+1/2)(a的平方+1/4)
答案是:a^4-1/8

=(a^2-1/4)(a^2+1/4)=a^4-1/16。这里边用到了两次这个公式,(a-b)(a+b)=a^2-b^2