Question

 matriz A de ordem 1 x 3, sendo aij= i+j:

Answer 1

$A= \left[\begin{array}{ccc}a_{11}&a_{12}&a_{13}\end{array}\right] \\ \\ A= \left[\begin{array}{ccc}{1+1}&{1+2}&{1+3}\end{array}\right] \\ \\ \boxed{A= \left[\begin{array}{ccc}{2}&{3}&{4}\end{array}\right] }$