Δ=
|2 -7 5|
|1 5 -5| =70-10+140-100-20+49=129,
|4 -2 7|
Δ_(x)=
|9 -7 5|
|-2 5 -5| = 315+20+840-600-90-98=387
|24 -2 7|
Δ_(y)=
|2 9 5|
|1 -2 -5| =-28+120-180+40+240-63=129,
|4 24 7|
Δ_(z)=
|2 -7 9|
|1 5 -2| = 240-18+56-180-8+168=258,
|4 -2 24|
x=( Δ_(x))/ Δ =387/129=3,
y=( Δ_(y))/ Δ =129/129=1,
z=( Δ_(x))/ Δ =258/129=2.
Ответ: (3;1;2).