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(1+4x)(1-4x)+16(1/4-x)(x+1/4)=?
人气:425 ℃ 时间:2020-05-14 13:50:33
解答
(1+4x)(1-4x)+16(1/4-x)(x+1/4)
=1-16x^2+16*(1/16-x^2)
=1-16x^2+1-16x^2
=2-32x^2
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