а) а2 + ab — 7а – 7ь при а = 6,6, b = 0,4;
б) х2 – xy – 4х + 4у при х = 0,5, y = 2,5;
в) 5а2 – 5ах — 7а + 7х при а = 4, х = -3;
г) хb – xc + Зc 3b при х = 2, b = 12,5, с = 8,3;
д) ау – ах — 2x + 2у при а = -2, х = 9,1, y = -6,4;
е) Зах – 4by — 4ay + 3bx при а = 3, b = -13, x=-1, y = -2.
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