Question

Решить систему уравнений:
$\left \{ {9 ^{x+y} =729 } \atop {3^ {x-y-1} =1}} \right.$

Answer 1

$\left \{ {{9^{x+y}=9^{3}} \atop {3^{x-y}=3^{0}}} \right.\left \{ {{x+y=3} \atop {x-y=0}} \right.\left \{ {{x=1,5} \atop {y=1,5}} \right.$