найдите алгебраическую сумму многочленов: (8a²-10ab-b²)+(-6a²+2ab-b²)+(a²-8ab+4b²)
(4a²-2ab+b²)-(-a²+b²-2ab)+3a²+b²-ab)
(4a²-2ab+b²)-(-a²+b²-2ab)+3a²+b²-ab)
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8a^2-ab+b^2