谢谢,化简下面的题.谢谢,要过程.(1)3x²-[7x-(4x-3)-2x²] (2)-2分之1a-2(a-2分之1b²)-(2分之3a-3分之1b²)
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![谢谢,化简下面的题.谢谢,要过程.(1)3x²-[7x-(4x-3)-2x²] (2)-2分之1a-2(a-2分之1b²)-(2分之3a-3分之1b²)](/uploads/image/z/1258428-12-8.jpg?t=%E8%B0%A2%E8%B0%A2%2C%E5%8C%96%E7%AE%80%E4%B8%8B%E9%9D%A2%E7%9A%84%E9%A2%98.%E8%B0%A2%E8%B0%A2%2C%E8%A6%81%E8%BF%87%E7%A8%8B.%281%293x%26%23178%3B%EF%BC%8D%5B7x%EF%BC%8D%284x%EF%BC%8D3%29%EF%BC%8D2x%26%23178%3B%5D++++++++++++++++++++++++++++%282%29%EF%BC%8D2%E5%88%86%E4%B9%8B1a%EF%BC%8D2%28a%EF%BC%8D2%E5%88%86%E4%B9%8B1b%26%23178%3B%29%EF%BC%8D%282%E5%88%86%E4%B9%8B3a%EF%BC%8D3%E5%88%86%E4%B9%8B1b%26%23178%3B%29)
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谢谢,化简下面的题.谢谢,要过程.(1)3x²-[7x-(4x-3)-2x²] (2)-2分之1a-2(a-2分之1b²)-(2分之3a-3分之1b²)
谢谢,化简下面的题.谢谢,要过程.
(1)3x²-[7x-(4x-3)-2x²]
(2)-2分之1a-2(a-2分之1b²)-(2分之3a-3分之1b²)
谢谢,化简下面的题.谢谢,要过程.(1)3x²-[7x-(4x-3)-2x²] (2)-2分之1a-2(a-2分之1b²)-(2分之3a-3分之1b²)
解
3x²-[7x-(4x-3)-2x²]
=3x²-(7x-4x+3-2x²)
=3x²-(3x+3-2x²)
=5x²-3x-3
-1/2a-2(a-1/2b²)-(3/2a-1/3b²)
=-1/2a-2a+b²-3/2a+1/3b²
=-2a-2a+4/3b²)
=-4a+4/3b²