Question

va rog furmos ajutorrr

A={x∈N/ (7x9:9)=1


7x9 are bara adeasupra

Answer 1

A={x∈N/ (7x9:9)=1 }

(7x9:9)=1 => 7+x+9≠18, deci,  x≠2

x∈{0, 1, 3, 4, 5, 6, 7, 8, 9}

A={0, 1, 3, 4, 5, 6, 7, 8, 9}