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2. a²/4b² x 8a³b^4 = a² x 2a³b² = 2a^5 b² (C)
3. 2a²b x 3ab² / a²b = 6ab² (B)
4. 2x² - 3y + x²y - x² + 3y - 2x²y = x² - x²y (C)
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