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= 6 × 10³= 6 000
=(2^7 + 2^7) /2² = ( 2 × 2^7) / 2² = 2^8 / 2² = 2^6= 64
=(3^14 -3^15) / 3^12= [3^12(3^2 -3^3(] / 3^12= 9-27 = -18