2x^n+2-8x^n=?x^5-x^3=?

已知集合P={x|x=2n,n∈N^+},集合Q={x|x=3n,n∈N*}.则P∩Q等于多少?,A,{x|x=n,n∈N*}B.{x|x=5n,n∈N*}C,{x|x=12n,n∈N*}D,{x|x=6n,n∈N*} 2x^n+2-8x^n=?x^5-x^3=? (8x^n+1-3x^n-1)-2(-x+9x^n+1-4x^n)= (4x^n-2x^n-1-3x^n+2)÷（-5x^n-1) x^n-1(3x^n+4x^n+1-5x^n+2) (-x^2n-2)*(-x)^5÷[x^n+1*x^n*(-x)]=? C语言 f(x)=1+x+x^2/2!+x^3/3!+...+x^n/n!直到|x^n/n| f(x)=e^x-x 求证(1/n)^n+(2/n)^n+...+(n/n)^n (-x)^3x^n-1+x^2n(-x)^3 x^n*x^n+1*(-x)^2n*x+(-x)^2n+3x^2n-2*x 设n为正整数,且x^3n=4,求x^2n·x^4n+x^4n·x^5n 求和：Sn=1-3x+5x^2-7x^3+.+(2n+1)(-x)^n(n属于N*) 若x^3n=2,试求x^6n+x^4n乘以x^5n的值 x的^3n=2,求x^6n+x^4n*x^5n的值 x^2n=5 求(2x^3n)^2/4x^2n 求和x+x^2+x^3+…x^n= x^2n-3x^n (2x-3)(x-n)=2x^2+5x+m求m与n