Question

Sabendo que log 2 = 0,3 e log 3 = 0,48 então o log 0,48 é
a) 1,32
b) - 1,32
c) 0,32
d) - 0,32
e) 2,03

Answer 1

$\Large\boxed{\begin{array}{l}\sf\ell og0,48=\ell og\dfrac{48}{100}=\ell og48-\ell og100\\\\\sf \ell og0,48=\ell og 2^4\cdot3-2\\\sf\ell og0,48=4\ell og2+\ell og3-2\\\sf \ell og0,48=4\cdot0,3+0,48-2\\\sf\ell og0,48=1,2+0,48-2\\\sf \ell og0,48=-0,32\\\huge\boxed{\boxed{\boxed{\boxed{\sf\red{\maltese}\blue{~alternativa~d}}}}}\end{array}}$