8,7×10^12, -1,32×10^0 , 8,71 ×10^-15 , π× 10^4 , -9,9 ×10 , -3×10^-7 , 10× 10^5
exercice 4
7283= 7,283 × 10^3
25000= 2,5 × 10^4
654,98 = 6,54 × 10^2
12,47 = 1,247 × 10^1
0,0058= 5,8 × 10^-3
0,000149= 1,49 × 10^-4
0,67× 10^2 = 6,7 × 10^-1
159× 10^-5 = 1,59 × 10^-3
0,009 ×10^-7 = 9 × 10^-10
