已知m-m^-1=3,求m^2+m^-2的值

2025-06-22 07:40:18
推荐回答(1个)
回答1:

解:
m^2+m^(-2)
=m^2+1/(m^2)
=(m-1/m)^2+2×m×1/m
=3^2+2
=11