Записать вместо звёздочки одночлен а) (x - y) × * = xa - ya
б) * × (2b - 3c) = 2bm - 3cm
в) (2x - y + 3zx) × * = -2x²a² + ya²x - 3za²x²
г) (x² - x + 2) × * = x³y³ - x²y³ + 2xy³
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