已知m+1⼀m=3,则m^2+1⼀m^2= ???

2025-01-19 11:36:06
推荐回答(4个)
回答1:

答案是7
将m+1/m=3平方可得m^2+2+1/m^2=9,所以m^2+1/m^2=7

回答2:

m^2+1/m^2
=(m+1/m)^2-2*m*(1/m)
=3^2-2
=7

回答3:

m^2+1/m^2=(m+1/m)^2-2M*1/M=3^2-2=7

回答4:

m^2+1/m^2
=(m+1/m)^2-2
=3^2-2
=7