what is $(-1)^{-3} \cdot 1^3 + (-3)^{-5} \cdot 3^5 + (-5)^{-7} \cdot 5^7$.
(−1)−3⋅13+(−3)−5⋅35+(−5)−7⋅57=−113⋅13−135⋅35−157⋅57=−1−1−1=−3
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Thank you
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