-16/9a^2+81/4b^2= 因式分解

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-16/9a^2+81/4b^2=因式分解-16/9a^2+81/4b^2=因式分解-16/9a^2+81/4b^2=因式分解解-16/9a^2+81/4b^2=81/4b^2-16/9a^2=(9/

-16/9a^2+81/4b^2= 因式分解
-16/9a^2+81/4b^2= 因式分解

-16/9a^2+81/4b^2= 因式分解
解-16/9a^2+81/4b^2
=81/4b^2-16/9a^2
=(9/2b)^-(4/3a)^2
=(9/2b+4/3a)(9/2b-4/3a)