作业帮[(x+1/4y)²-(x-1/4y)²]·(3x-1/3y)(1/3+3x）（1/9y²+9x²）其中x=1 ,y=-3
来源：学生作业帮助网 编辑：作业帮 时间：2024/08/01 06:57:19
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[(x+1/4y)²-(x-1/4y)²]·(3x-1/3y)(1/3+3x）（1/9y²+9x²）其中x=1 ,y=-3
[(x+1/4y)²-(x-1/4y)²]·(3x-1/3y)(1/3+3x）（1/9y²+9x²）其中x=1 ,y=-3
[(x+1/4y)²-(x-1/4y)²]·(3x-1/3y)(1/3+3x）（1/9y²+9x²）其中x=1 ,y=-3
原式=(x+1/4y+x-1/4y)(x+1/4y-x+1/4y)*(9x²-1/9y²)(9x²+1/9y²)
=2x*1/2y*(81x^4-1/81y^4)
=81x^5y-1/81xy^5
=-243-3
=-246