A = 2,000000001
B = 1,999999999
1) a) Ecrire À = 2 + 10n
A = 2 + 0,000000001
A = 2 + 0,0000000001 x 10
Avec n = 0,0000000001
b) B = 2 - 10m
B = 2 - 10 x 0,0000000001
Avec m = 0,0000000001
2) calcul A + B :
2,000000001 + 1,999999999 = 4
2 + 0,0000000001 x 10 + 2 - 10 x 0,0000000001 =
4 + 0,000000001 - 0,000000001 = 4
3) calcul A - B
2,000000001 - 1,999999999 = 0,000000002
2 + 0,0000000001 x 10 - 2 + 10 x 0,0000000001 =
2 - 2 + 0,0000000001 x 10 + 10 x 0,0000000001 =
0 + 0,000000001 + 0,000000001 =
0,000000002