Question

$left { {{ sqrt{x} - sqrt{y}=1 } atop{ sqrt{x} + sqrt{y}=19} right.$

Answer 1

Решение смотри на фото

Answer 2

$left { {{ sqrt{x} - sqrt{y} =1 } atop { sqrt{x} + sqrt{y} = 19}} right. \\\ left { {{sqrt{x}-sqrt{y}=1} atop {sqrt{x}+sqrt{y}=19}} right.\\ a=sqrt{b}; c=sqrt{y}; ; to ; ; left { {{a-b=1} atop {a+b=19}} right. \\{2b=18}} right. \\ left { {{a=10} atop {b=9}}\ right. \\ left { {{sqrt{x}=10} atop {sqrt{y}=9}} \ right. \\ left { {{x=100} atop {y=81}} right.$