1).(a^6)^2=a^12; 2). a^4*a^3=a^7; 3).(a^9)^5:a^30=a^45:a^30=a^15.
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1).(a^6)^2=a^12; 2). a^4*a^3=a^7; 3).(a^9)^5:a^30=a^45:a^30=a^15.