Ответ:
a + b = (2 + (-1), -3 + 2) = (1, -1);
a - b = (2 - (-1), -3 - 2) = (3, -5);
|a + b| = sqrt(1^2 + (-1)^2) = sqrt(2).
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Ответ:
a + b = (2 + (-1), -3 + 2) = (1, -1);
a - b = (2 - (-1), -3 - 2) = (3, -5);
|a + b| = sqrt(1^2 + (-1)^2) = sqrt(2).