9/a^4+(5a^2-9)^2/16a^4=1,是怎么整理得:9a^4-90a^2+225=(3a^2-15)^2=0
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两边乘16a^4
144+25a^4-90a²+81=16a^4
所以
9a^4-90a²+225=0
即a^4-10a²+25=0
(a²-5)²=0
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