ppts.net
当前位置:首页>>关于已知x的2n次方等于3,求x的3n次方的4次方的值的资料>>

已知x的2n次方等于3,求x的3n次方的4次方的值

2011-02-19 已知x的2n次方等于3,求(3x的3n次方)的平方的值 16 2012-05-19 已知x的2n次方=5,那么(2x的3n次方)的平方-3(x...

题干不清

(3x^3n)^2-4(x^2)^2n =(9x^6n)-4(x^2n)^2 =9(x^2n)^3-4(x^2n)^2 =9x5^3-4x5^2 =9x125-4x25 =1025

27

原式=9x^(6n)-4x^(4n) =9(x^2n)³-4(x^2n)² =9*5³-4*5² =1025

x^n=2 [3x^(3n)]2-4(x2×x)^2n =9x^(6n)-4x^(6n) =5x^(6n) =5(x^n)^6 =5×2^6 =5×64=320

答案是-81 文字过程: 因为x的2n次方=3 所以(x的3n次方)2次方-4(x的3次方)2n次方 =(x的2n次方)3次方-4(x的2n次方)3次方 =-3(x的2n次方)3次方 =-3*(3的3次方) =-81 图片过程:

x^n=2 [3x^(3n)]²-4(x²×x)^2n =9x^(6n)-4x^(6n) =5x^(6n) =5(x^n)^6 =5×2^6 =5×64=320

因为x^2n=4 所以(3x^(3n))^2= 9 (x^(2n))^3= 9 *4^3=9*64=576 (*^__^*) 嘻嘻……望采纳~~~

网站首页 | 网站地图
All rights reserved Powered by www.ppts.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com