Pour l'exercice 2,
[tex]{a}^{m}\times {a}^{n} = {a}^{m + n} \\ \frac{ {a}^{m} }{ {a}^{n} } = {a}^{m - n} \\ {a}^{ - n} = \frac{1}{ {a}^{n} } [/tex]
Ainsi,
a) 2^-8 × 2^4 = 2^(-8+4) = 2^-4 = 1/(2^4) = 1/16 (=0.062.5)
b) 781
c) 11^4/11^8 = 11^(4-8) = 11^-4 = 1/11^4 = 1/14641
d) Un nombre décimal très petit :^)
Pour le 1, il faut calculer... Merci Josselin :D
a) 2^7 = 2×2×2×2×2×2×2 = 4×4×4×2=16×8=128
b) 5^4 = 5×5×5×5 = 25×25 = 625
c) (-3)^5 = -3×-3×-3×-3×-3 = 9×9×-3 = -243
d) 2^-3 = 1/2^3 = 1/8 (=0.125)
