x=6.25
y=34
Пошаговое объяснение:
x*y=212.5
(x+2.5)*y=297.5
решение
y=212.5/x
(x+2.5)*(212.5/x)=297.5
212.5/x=297.5/(x+2.5)
(x+2.5)/x=297.5/212.5
(x+2.5)/x=1.4
x+2.5=1.4x
1.4x=x+2.5
1.4x-x=2.5
0.4x=2.5
x=2.5/0.4
y=212.5/6.25
x=6.25
y=34
Пошаговое объяснение:
x*y=212.5
(x+2.5)*y=297.5
решение
y=212.5/x
(x+2.5)*(212.5/x)=297.5
212.5/x=297.5/(x+2.5)
(x+2.5)/x=297.5/212.5
(x+2.5)/x=1.4
x+2.5=1.4x
1.4x=x+2.5
1.4x-x=2.5
0.4x=2.5
x=2.5/0.4
x=6.25
y=212.5/6.25
y=34