钱学森的爱国事迹500:(x+2\1)的平方剩(x-2\1)的平方的值
来源:百度文库 编辑:中科新闻网 时间:2024/06/03 01:53:07
要过程
(x+2\1)的平方剩(x-2\1)的平方
=[(x+2\1)剩(x-2\1)]的平方
=(x^2-1/4)^2
(X+1/2)^2*(X-1/2)^2
=[(X+1/2)(X-1/2)]^2
=[X^2-1/4]^2
=X^4-1/2(X^2)+1/16
(x+2\1)的平方剩(x-2\1)的平方
=[(x+2\1)剩(x-2\1)]的平方
=(x^2-1/4)^2
(X+1/2)^2*(X-1/2)^2
=[(X+1/2)(X-1/2)]^2
=[X^2-1/4]^2
=X^4-1/2(X^2)+1/16