Question

 valor de W= log 2+log 20+log 25 é:

Answer 1

$W= log_{} 2+ log_{} 20+ log_{} 25=log_{} 2+ log_{} 2.10+ log_{} 5^{2} =$$log_{} 2+ log_{} 2+log_{}10+ 2log_{} 5=2log_{}2+1+2log_{}( \frac{10}{2} ) =$$=2log_{}2+1+2.(log_{}10- log_{}2)=2log_{}2+1+2.1-2log_{}2=3$