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Sagot :

Bonjour

a. 7.89x10^2x10^4 = 7.89x10^(2+4) = 7.89x10^6

b. 0.67x10^-3 = 6.7x10^-1x10^-3 = 6.7x10^-1-3 = 6.7x10^-4

c. 0.003x10^6=3x10^-3x10^6 = 3x10^-3+6 = 3x10^3

d. 12.8x10^-1 = 1.28x10^1x10^-1 = 1.28x10^1-1 = 1.28x10^0

J'espère t'avoir aidé !

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