(x的n次方+y的n次方)(x的n次方-y的n次方)-(x的n次方+y的n次方)²

问题描述:

(x的n次方+y的n次方)(x的n次方-y的n次方)-(x的n次方+y的n次方)²
当x=2时,求代数式(1- x/3)(1+ x/3)(1+ x^2/3)(1+ x^4/81)的值
漏了,还有一题
m- 1/4(1-m)- 1/3m(2-m/4)

1、(x的n次方+y的n次方)(x的n次方-y的n次方)-(x的n次方+y的n次方)²=(x^n+y^n)(x^n-y^n)-(x^n+y^n)^2=(x^n)^2-(y^n)^2-[x^(2n)+2(x^n)*(y^n)+y^(2n)]=x^(2n)-y^(2n)-x^(2n)-y^(2n)-2(x^n)*(y^n)=-2y^(2n)-2(...