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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祝你学习进步,更上一层楼!
不明白请及时追问,满意敬请采纳,O(∩_∩)O谢谢~~-4x²y-8xy²+2x²y-3xy²=-2x²y-11xy²