稻草人英语怎么说:一道计算题 急用

来源:百度文库 编辑:中科新闻网 时间:2024/05/09 11:05:42
x^2-(x+2)(x-2)-(x+1/x) ^2

=x^2-x^2+4-x^2-2-1/x^2
=-x^2+2-1/x^2
=-(x-1/x)^2

=x^2-x^2+4-x^2-2-1/x^2
=-x^2+2-1/x^2
=-(x-1/x)^2

x^2-x^2+4-x^2-2-1/x^2
=-x^2+2-1/x^2
=-(x-1/x)^2

=x^2-x^2+4-x^2-2-1/x^2
=-x^2+2-1/x^2
=-(x-1/x)^2

x^2-(x+2)(x-2)-(x+1/x) ^2
=x^2-(x^2-4)-[x^2+1/x^2+2x(1/x)]
=x^2-x^2+4-x^2-1/x^2-2
=-x^2-1/x^2+2 or =-(x-1/x)^2