若a-1/a=2,则a²+1/a²的值为
问题描述:
若a-1/a=2,则a²+1/a²的值为
答
a^2+1/a^2
=(a-1/a)^2+2
=4+2
=6
若a-1/a=2,则a²+1/a²的值为
a^2+1/a^2
=(a-1/a)^2+2
=4+2
=6