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= (2x)³-(5y)³-3(2x)²×(5y)+3(2x)×(5y)²-[(2x)³+(5y)³+3(2x)²×(5y)+3(2x)×(5y)²]
= 8x³-125y³-60x²y+150xy²-8x³-125y³-60x²y-150xy²
= -250y³-120x²y
1 2 1
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