Question

1) 5^-3•5^-9/5^-11
2) 4•10^-1+9•10^-2+1•10^-4

Answer 1

1) 5^-3•5^-9 = 5^-12
5^-12/5^-11 = 5^-1 = 1/5
2) 4•10^-1 = 4/10=0,4
9•10^-2 = 9/100= 0,09
1•10^-4 = 1/10000= 0,0001
0,4 + 0,09+ 0,0001= 0,4901