已知x+1⼀x=4,求x^2+x^(-2)的值

2024-12-15 15:27:05
推荐回答(3个)
回答1:

x^2+1/x^2
=(x+1/x)^2-2
=4^2-2
=16-2
=14

回答2:

x^2+x^(-2)
=(x+1/x)²-2*x*(1/x)
=4²-2
=14

回答3:

x^2+x^(-2)=(x+1/x)^2-2=4^2-2=14