Tìm n biết 27^n/9=3^n

Tìm nZn\in Z

a/19.27n=3n\dfrac{1}{9}.27^n=3^n

b/32.34.3n=373^{-2}.3^4.3^n=3^7

c/21.2n+4.2n=9.252^{-1}.2n+4.2^n=9.2^5

d/32n.16n=204832^{-n}.16^n=2048

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