Известно, что +−+−+=3
x
+
y
x

y
+
x

y
x
+
y
=
3
. Найдите значение выражения 2+22−2+2−22+2
x
2
+
y
2
x
2

y
2
+
x
2

y
2
x
2
+
y
2
.СРОЧНО
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