x^4+1/x^4+x^2+1/x^2=4
解方程
x^4+1/x^4+x^2+1/x^2=4
参考答案:x^4+1/x^4+x^2+1/x^2=4
(x^2-1/x^2)^2+(x-1/x)^2=0
x2-1/x^2=0,x-1/x=0
x^4=1,x^2=1
x1=1,x2=-1.
解方程
x^4+1/x^4+x^2+1/x^2=4
参考答案:x^4+1/x^4+x^2+1/x^2=4
(x^2-1/x^2)^2+(x-1/x)^2=0
x2-1/x^2=0,x-1/x=0
x^4=1,x^2=1
x1=1,x2=-1.