3.[tex]3 ^{x+3} +3 ^{x+2} -3 ^{x+1} =315[/tex]
[tex]3 ^{x+1} (3 ^{2} +3-1)=315[/tex]
[tex]3 ^{x+1} (3 ^{2} +3-1)=315[/tex]
[tex]3 ^{x+1} *11=3 ^{2}*5*7[/tex]
[tex]3 ^{x+1} = \frac{3 ^{2}*5*7 }{11} [/tex]
De,aici,nu-mi,mai,da...
4.[tex] 8^{23} =(2 ^{3) ^{23} } =2 ^{69} [/tex]
[tex]16 ^{17} =(2 ^{4} ) ^{17} =2 ^{68} [/tex]
[tex]=\ \textgreater \ 8 ^{23} \ \textgreater \ 16 ^{17} [/tex]
