[(x+1/4y)²-(x-1/4)²]·(3x-1/3y)(3/1y+3x)(1/9y²+9x²)
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[(x+1/4y)²-(x-1/4)²]·(3x-1/3y)(3/1y+3x)(1/9y²+9x²)
[(x+1/4y)²-(x-1/4)²]·(3x-1/3y)(3/1y+3x)(1/9y²+9x²)
[(x+1/4y)²-(x-1/4)²]·(3x-1/3y)(3/1y+3x)(1/9y²+9x²)
原式=(x²+1/2xy+1/16y²-x²+1/2xy-1/16y²)(9x²-1/9y²)(9x²+1/9y²)
=xy(81x^4-1/81y^4)
=81x^5y-1/81xy^5