合并同类项-5/3(x+y)²-6(x+y)+3(x+y)²+4/3(x+y)
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合并同类项-5/3(x+y)²-6(x+y)+3(x+y)²+4/3(x+y)
合并同类项-5/3(x+y)²-6(x+y)+3(x+y)²+4/3(x+y)
合并同类项-5/3(x+y)²-6(x+y)+3(x+y)²+4/3(x+y)
-5/3(x+y)²-6(x+y)+3(x+y)²+4/3(x+y)
=4/3(x+y)²-14/3(x+y)