若m^2-5m+1=0,求m^2+1⼀m^2的值

2025-01-19 23:28:33
推荐回答(1个)
回答1:

等式两边同除以m
m-5 +1/m=0
m+ 1/m=5
m²+ 1/m²
=m² +2 +1/m² -2
=(m+ 1/m)² -2
=5²-2
=25-2
=23
m²+ 1/m²的值为23