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：2024/05/07 20:57:36
![[(x+1/4y)²-(x-1/4y)²]·(3x-1/3y)(1/3+3x）（1/9y²+9x²）其中x=1 ,y=-3](/uploads/image/z/1652951-47-1.jpg?t=%5B%28x%2B1%2F4y%29%26%23178%3B-%28x-1%2F4y%29%26%23178%3B%5D%C2%B7%283x-1%2F3y%29%281%2F3%2B3x%EF%BC%89%EF%BC%881%2F9y%26%23178%3B%2B9x%26%23178%3B%EF%BC%89%E5%85%B6%E4%B8%ADx%3D1+%2Cy%3D-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
[(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