先化简,再求值:[5a^4*a^2-(3a^6)^2/(a^2)^3]/(-2a^2)^2,其中a=-5

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先化简,再求值:[5a^4*a^2-(3a^6)^2/(a^2)^3]/(-2a^2)^2,其中a=-5先化简,再求值:[5a^4*a^2-(3a^6)^2/(a^2)^3]/(-2a^2)^2,其中

先化简,再求值:[5a^4*a^2-(3a^6)^2/(a^2)^3]/(-2a^2)^2,其中a=-5
先化简,再求值:[5a^4*a^2-(3a^6)^2/(a^2)^3]/(-2a^2)^2,其中a=-5

先化简,再求值:[5a^4*a^2-(3a^6)^2/(a^2)^3]/(-2a^2)^2,其中a=-5
[5a^4*a^2-(3a^6)^2/(a^2)^3]/(-2a^2)^2
=(5a^6-9a^12/a^6)/(4a^4)
=(5a^6-9a^6)/(4a^4)
=-4a^6/(4a^4)
=-a^2