Question

seja log 10²= 0,301, calcule: log10 40 + log 10 400

Answer 1

log 20+log 40+log 800 
log 2*10+log 2²*10+log 2³*10² 
log 2 + log 10 + log 2² + log 10 + log 2³ + log 10² 
log 2 + log 10 + 2log 2 + log 10 + 3log 2 + 2log 10 
0,301 + 1 + 2.0,301+ 1 + 3.0,301 +2.1 
5,806