1. (-у^7)^5*(у^3*у^8)^2 = -y^35*y^22 = -y^57
2. (а^3)^2*а^15/а^17 = a^(6+15-17) = a^4
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Answers & Comments
1. (-у^7)^5*(у^3*у^8)^2 = -y^35*y^22 = -y^57
2. (а^3)^2*а^15/а^17 = a^(6+15-17) = a^4