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b)(2a^4b^2c^2)^5:(0,5a^2bc^2)^3=2^5a^20b^10c^10 : (1/2)^3a^6b^3c^6=2^5a^20b^110c^10 : 2^(-3)a^6b^3c^6=2^(5-(-3)a^(20-6)b^(10-3)c^(10-6)=2^(5+3)a14b^7=2^8a^14b^7
c)
(-3xy^2z^2):(2y^2z^3)=-3/2xz(-1)=-3X/2z