(x + y)² = 169
-
(x - y)² = 121
-----
x² + 2xy + y² - x² + 2xy - y² = 169 - 121
4xy = 48
xy = 12
ответ В
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Verified answer
(x + y)² = 169
-
(x - y)² = 121
-----
x² + 2xy + y² - x² + 2xy - y² = 169 - 121
4xy = 48
xy = 12
ответ В