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b) ^- to znaczy do potęgi
*- mnożenie
(3^4 * 5^7)^3 /5^9 =3^12 * 5^21 /5^9= 3^12 * 5^12
Zad.6
8^90= (2^3)^90=2^270
2^270:2=2^269
4^90=(2^2)^90=2^180
8^45= (2^3)^45=2^135
4^45=(2^2)^45=2^90
2^269
Ostatnia liczba jest równa połowie 8^90.
Zad.10
10^100 * 10^2=10^102
10^100 * 10^6= 10^106
10^100 * 10^-2=10^98
10^100 * 10^100= 10^200
Zad.11
10^18 * 0,1g= 10^17g= 10^14 kg
ludzie: 6 * 10^9 * 50kg= 300*10^9 kg= 3* 10^11 kg
b) 10^14/ 6 * 10^19= 10^5/6 ~~16667kg