3log7×25log32×49log81

[tex]3 log7 + \ {5}^{2} log(2) {}^{5} + {7}^{2} log(3) {}^{4} \\ 3 log(7) + \frac{5}{2} .5 log(2) + \frac{4}{2} .7 log(3) \\ 3 log7 + \frac{5}{2} 5 log2 + 14 log3[/tex]