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5^(-3) * 5^(-4) * (5³)^(-2) : [5^(-4) : 25^(-3)] =
= 5^(-3-4) * 5^(-6) : [5^(-4) : 5²^(-3)] =
5^(-7-6) : 5^(-4+6) = 5(-13) : 5² = 5^(-13-2) = 5^(-15)
b)
64 * 8(-3) * 2^5 * 4^(-2)³ : [2^5^(-3) : 8^(-2)^4]^(-2) =
= 2^6 * (2³)^(-3) * 2^5 * (2²)^(-6) : [2^(-15) : 8^(-8)]^(-2)
= 2^6 * 2^(-9) * 2^5 * 2^(-12) : [2^(-15) : 2³^(-8)]^(-2) =
= 2^(-10) : [2^(-15) * 2^(-24)]^(-2)] =
= 2^(-10) : [(2^9 ^(-2) = 2^(-10) ; 2^(-18) = 2^8 =
= 256