Reduza as expressões a uma só potencia
C- (6,9) elevado a 15 : (6,9) elevado a 10 X (6,9) elevado a 4
D- [(9/17)elevado a 4 ] elevado a -5
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c) 
d)![\left[\left(\dfrac{9}{17}\right)^{4}\right]^{-5}=\left(\dfrac{9}{17}\right)^{4\cdot(-5)}=\left(\dfrac{9}{17}\right)^{-20}](https://tex.z-dn.net/?f=%5Cleft%5B%5Cleft%28%5Cdfrac%7B9%7D%7B17%7D%5Cright%29%5E%7B4%7D%5Cright%5D%5E%7B-5%7D%3D%5Cleft%28%5Cdfrac%7B9%7D%7B17%7D%5Cright%29%5E%7B4%5Ccdot%28-5%29%7D%3D%5Cleft%28%5Cdfrac%7B9%7D%7B17%7D%5Cright%29%5E%7B-20%7D "\left[\left(\dfrac{9}{17}\right)^{4}\right]^{-5}=\left(\dfrac{9}{17}\right)^{4\cdot(-5)}=\left(\dfrac{9}{17}\right)^{-20}")
d)
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