Решите способом добавления систему уравнений: 1) 2x + 4y = 6,
5x-2y = -9;
2) x + 2y = 8,
3x-4y = 6;
3) x + 2y = 2,
-4x-5y = 7.
5x-2y = -9;
2) x + 2y = 8,
3x-4y = 6;
3) x + 2y = 2,
-4x-5y = 7.
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