Sagot :
8) a) 10^7-2 = 10^5
b) 10^9-3 = 10^6
c) 10^10-5 = 10^5
d) 10^6-9 = 10^-3
9) a) 10^7-6 = 10^1
b) 10^3-9 = 10^-6
c) 10^-5-4 = 10^-9
d) 10^ 5-(-4) = 10^5+4 = 10^9
b) 10^9-3 = 10^6
c) 10^10-5 = 10^5
d) 10^6-9 = 10^-3
9) a) 10^7-6 = 10^1
b) 10^3-9 = 10^-6
c) 10^-5-4 = 10^-9
d) 10^ 5-(-4) = 10^5+4 = 10^9