Question

81:n×n÷n÷n=1.Ce valoare are n?

Answer 1

$\frac{81}{n} * \frac{n}{n} * \frac{1}{n} =1 \\ \\ \frac{81n}{ n^{3} } =1 \\ \\ \frac{81}{ n^{2} }=1$

$n^{2} = 1*81*1 \\ n^{2} = 81$

=>  $n= \sqrt{81}$

Facem verificare:

81:√81×√81÷√81÷√81 = 1 => 81÷81÷√81÷√81 = 1 => 1÷1=1 (A)