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b) 2,3 . 10^8
c) 4,4 . 10^8
d) 3,8 . 10^-5
e) 1,2 . 10^-5
f) 1,4 . 10-²
2) 245 × 456
= 111720
= 1,1 . 10^5
b)2653 × 0,3
= 795,9
= 8,0 . 10²
c) 4817 ÷ 1176
= 4,1
d) 3215 ÷ 156
= 20,6
= 2,1 . 10
3a) 2,1 × 10^-5
= 0,000021
b) 5,71 . 10^-3
= 0,00571
c) 2,5 . 10^-4
= 0,00025
d) 3,75 . 10^-4
= 0,000375