3a^2-[7a^2-2a-3(a^2-a)+1]先去括号,再合并同类项

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收藏|2022/07/19 11:02

满意回答

2022/07/19 11:12

3a^2-[7a^2-2a-3(a^2-a)+1]=3a^2-[7a^2-2a-3a^2+3a+1]=3a^2-7a^2+2a+3a^2-3a-1=-a^2-a-1

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其他回答(1)
  • 3a²-[7a²-2a-3(a²-a)+1]=3a²-7a²+2a+3(a²-a)-1=3a²-7a²+2a+3a²-3a-1=(3a²-7a²+3a²)+(2a-3a)-1=(3-7+3)a²+(2-3)a-1=-a²-a-1
    回答于 2022/07/19 11:33
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