若a^2-3a=0,求a^4+1/a^4的值

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若a^2-3a=0,求a^4+1/a^4的值若a^2-3a=0,求a^4+1/a^4的值若a^2-3a=0,求a^4+1/a^4的值6561/816562/81由题可知,a(a-3)=0又因为a≠0,

若a^2-3a=0,求a^4+1/a^4的值
若a^2-3a=0,求a^4+1/a^4的值

若a^2-3a=0,求a^4+1/a^4的值
6561/81

6562/81

由题可知,
a(a-3)=0
又因为a≠0,
所以a=3
a^4+1/a^4=81+1/81