[(x+1/4y)^2+(x-1/4y)^2](2x^2-1/8y^2)
=（x^2+1/2y+1/16y^2+x^2-1/2y+1/16y^2）（2x^2-1/8y^2）
=(2x^2+1/8y^2)(2x^2-1/8y^2)
=4x^4-1/64y^4
化简计算 [(x+1/4y)^2+(x-1/4y)^2](2x^2-1/8y^2)
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