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Sagot :

=(2^11 x 1/2^13) /  4^-2
= (2^11 x 1^13) /  4^-2 x 2^13
= 2^11   / 4^-2 x 2^13
= 2^11  4^2 /  2^13
= 2^11  2^4 /  2^13
= 2^15 / 2^13 = 2^2 = 4







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