Bonsoir,
4 270 000 = 427 x 10 000 = 427 x 10^4
4 270 000 = 42,7 x 100 000 = 42.7 x 10^5
4 270 000 = 4,27 x 1 000 000 = 4.2 x 10^6
4 270 000 = 0.427 x 10 000 000 =0.427 x 10^7
A= 640 = 6.4 x 10²= 64 x 10= 0.64 x 10^3
B= 123000000000 = 123 x 10^9 = 1.23 x 10^11
C= 243.5 x 10 ^3 = 2.435 x 10^5 = 24.35 x 10^4
D= 21 x 10^4 = 2.1 x 10^5= 0.21 x 10^6
E= 15 x 10^3 = 1.5 x 10^4 = 0.15 x 10^5
J'espère t'avoir aidé