Răspuns:
1.
a)4^x•(4^2 + 4 + 1) = 336
4^x • 21 = 336
4^x = 16 = 4^2 =>x=2
b)9^41•(9^2 - 9 - 1) = 71 • 3^x
9^41 • 71 = 71 • 3^x
(3^2)^41 = 3^x =>x=82
c)7^(x+1)•(1+7)=8 • 7^11
x+1=11 =>x=10
2.
(3^2019 - 1)/2
3.
a)18•(1 + 3^60 + 7^70 + 5^80):(1 + 3^60 + 7^70 + 5^80) = 18
b)7^22 : 7^11 + 7^12 = 7^11 + 7^12 = 7^11 • 8
c)5^18 : 5^8 • 5^33 = 5^43
4.
a=2, b=6 =>a+b=8
5.
a)2^20•(2^5 - 7) = 2^20•25 = 2^20•5^2
b)3^34•4
c)2^4•10^2
d)2^4•5^2
