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a) 94 * 10 ^4 = 940000 = 9.4 x 10 ^5

b) - 224  x 10 ^7 = - 2 240 000 000 =  -  2.24 x 10 ^9

c) 0.65 x 10 ^6 = 650 000 = 6.5 x 10 ^5

d) 21 x 10 ^-5 = 0,00021 = 2.1 x 10 ^-4

e) - 25.7 x 10 ^-5 = - 0.002575 = 2.575 x 10 ^-3

f) 40 x 10 ^-7 = 0.000040 = 4 x 10 ^-5

E = 48 x 10 ^3 sur 3 x 10 ^-3
E = 16 x 10 ^6
E = 16 000 000
E = 1.6 x 10^7