换底公式
a^[logb(c)]
=c^[logb(a)]
(√5)^[log{5}(-a)^2]
=(√5)^[log{5}(a^2)]
=(a^2)^[log{5}√5]
=(a^2)^(1/2)
=|a|
(√5)^[log{5}(-a)^2]
=(√5)^[(1/2)*log{√5}(-a)^2]
=(√5)^[log{√5}|a|]
=|a|
换底公式
a^[logb(c)]
=c^[logb(a)]
(√5)^[log{5}(-a)^2]
=(√5)^[log{5}(a^2)]
=(a^2)^[log{5}√5]
=(a^2)^(1/2)
=|a|
(√5)^[log{5}(-a)^2]
=(√5)^[(1/2)*log{√5}(-a)^2]
=(√5)^[log{√5}|a|]
=|a|