Question

Determinati nr nat x si y ,stiind ca xy7(cu bara de asupra)+3· 4xy(cu bara de asupra)=2143

Answer 1

xy7+3x4xy=2143
x=7
y=2

Answer 2

$\overline {xy7}+3*\overline {4xy}=2143$
$10*\overline {xy}+7+3(400+\overline{xy})=2143$
$10*\overline {xy}+7+1200+3*\overline{xy}=2143$
$13*\overline {xy}=936$
$\overline {xy}=72$