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y-4 x²z
1b) 12a^5b^3 = 3a³
4a²b^5 b²
2. (-2a³b^-4)^-2 = a^5b^6
5a^-5b^-6 (-2a³b^4)²
= a^5b^6
4a^6b^8
= 1
4ab²