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Sagot :

B = (15 x 7 x 10^(-3 + 7)) / (500 x 10-²)
    = (245 x 10^4) / (500 x 10-²)
    = 245 x 10^(4 + 2) / 500
    = 245 x 10^6 / 500
    = 490000
    = 4,9 x 10^5

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