a)3^26 = 3^x =>x=26
b)(5^2 - 4^2) : 3^2 = x
3^2 : 3^2 = x =>x=1
c)(2^12 • 3^7) : 3^7 = 2^x =>x=12
d)(2^6 • 3^10) : (2^4 • 3^6) : 3^2 = 6^x
2^2 • 3^2 = 6^x
(2•3)^2 = 6^x =>x=2
e)(2^5)^15 : (2^2)^5 : 2^6 = 2^x
2^(75-10-6) = 2^x =>x=51
f)1+2+3+...+50=(50•51)/2=25•51=1275 suma Gauss =>x=1275
