Ответы на вопрос:
A + B = 8
+ +
C – D = 6
= =
13 8
A + B = 8, B + D = 8 => A + B = B + D => A = D;
A + C = 13 => D + C = 13 => C = 13 – D;
C – D = 6 => 13 – D – D = 6 => 2D = 7 => D = 3.5,
C = 13 – D = 13 – 3.5 = 9.5;
A = D = 3.5;
A + B = 8 => B = 8 – A = 8 – 3.5 = 4.5.
ответ: A = 3.5; B = 4.5; C = 9.5; D = 3.5
Проверка.
3.5 + 4.5 = 8, 9.5 – 3.5 = 6,
3.5 + 9.5 = 13, 4.5 + 3.5 = 8.
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