Ответ:
8+(-3) < x+y < 12+(-1)
5 < x+y < 11;
8-(-3) < x - y < 12 -(-1)
11 < x - y < 13
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Ответ:
8+(-3) < x+y < 12+(-1)
5 < x+y < 11;
8-(-3) < x - y < 12 -(-1)
11 < x - y < 13