3x²-1-2x+5-x²-2x合并同类项-4x²y-8xy²+2x²y-3xy²

3x²-1-2x+5-x²-2x合并同类项
-4x²y-8xy²+2x²y-3xy²

3x²-1-2x+5-x²-2x
=2乘x的平方一4x一4
保证准确率~
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