Question

Ajutaţi-ma si pe mine va rog frumos: exerciţiul nr 4

Answer 1

a)
81^7=(3^4)^7=3^4*7=3^28
3^5^2=3^25
3^28:3^25=3^28-25=3^3=27
b)
4^12:2^22-8^9:2^26=(2^2)^12:2^22-(2^3)^9:2^26=2^2*12:2^22-2^3*9:2^26=
=2^24:2^22-2^27:2^26=2^(24-22)-2^(27-26)=2^2-2^1=4-2=2
c)
(25^2*5^4)^3:5^22-2^2^2=(5^4*5^4)^3:5^22-2^4=5^8*3:5^22-16=
=5^24:5^22-16=5^2-16=25-16=9