Ответы на вопрос:
x1 + x2 = -p
x1 * x2 = q
1) 3 + 5 = 8 = -p => p = -8
3 * 5 = 15 = q
2) -2 + 1 = - 1 = -p => p = 1
-2 * 1 = -2 = q
3) -1.4 * 3 = 1.6 = -q => q = -1.6
-1.4 * 3 = 4.2 = q
4) -0.3 + -10 = -10.3 = -q => q = 10.3
-0.3 * -10 = 3 = q
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