Ответы на вопрос:
1/(x + y) + 1/(x - y) = 15 (1)
4/(x + y) + 1/(x - y) = 36 (2)
делаем (2) - (1) 4*(1) - (2)
3/(x + y) = 21
3/(x - y) = 24
1/(x+y) = 7
1/(x - y) = 8
x + y = 1/7
x - y = 1/8
2x = 1/7 + 1/8 = 15/56
x = 15/112
2y = 1/7 - 1/8 = 1/56
y = 1/112
ответ (15/112, 1/112)
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