x^2n=5 求(2x^3n)^2/4x^2n

x^2n=5 求(2x^3n)^2/4x^2n 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 设n为正整数,且x^3n=4,求x^2n·x^4n+x^4n·x^5n 求Sn=3x+4x²+5x³+.+（n+2）x^n 已知x^n=2,求(3x^3n)^2-4(x^2)^2n 若x^2n=4,求x^6n和(3x^3n)^2 已知x^n=4,求x^2n,x^3n的值 已知（x^3n-2）^2·x^2n+4÷x^n=x^2n-5,求n的值 (4x^n-2x^n-1-3x^n+2)÷（-5x^n-1) x^n-1(3x^n+4x^n+1-5x^n+2) (2x-3)(x-n)=2x^2+5x+m求m与n 已知 x ^3n-2 ÷x^ n+1 =x^3-n×x^n+2,求n的值 设x^2n=3,求(1/3x^3n)·[4(x^5)^n]设x^2n=3,求(1/3x^3n)^3·[4(x^5)^n] 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*} 设x^2n=3,求(1/3x^3n)·[4(x^5)^n]急 求 4/(x+1)(x+3) + 4/(x+3)(x+5) +.+ 4/(x+2n-1)(x+2n+1) 已知x的3n次方=2,求x的6n次方+x的4n次方*x的5n次方的值为