(x+1/2)(x-1/2)(x的2次方+1/4)

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(x+1/2)(x-1/2)(x的2次方+1/4)(x+1/2)(x-1/2)(x的2次方+1/4)(x+1/2)(x-1/2)(x的2次方+1/4)(x+1/2)(x-1/2)(x的2次方+1/4)

(x+1/2)(x-1/2)(x的2次方+1/4)
(x+1/2)(x-1/2)(x的2次方+1/4)

(x+1/2)(x-1/2)(x的2次方+1/4)
(x+1/2)(x-1/2)(x的2次方+1/4)
=(x的2次方-1/4)(x的2次方+1/4)
=(x的4次方-1/16)