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2014-11-13T06:46:26+02:00
A) 4 :6=2=/3

7^2-3*2^4=49-6*16=49-96=-
2^30/3^18-5^12/5^12-2^3= 2^30/3^18-1-8=2^30/3^18-9=2^30/3^18-3^2