计算以及化简:3a²-[7a²-2a-3(a²-a)+1]还有呢:(8-x²y+7xy²-6xy)-[8xy-(x²y+y²x)]
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![计算以及化简:3a²-[7a²-2a-3(a²-a)+1]还有呢:(8-x²y+7xy²-6xy)-[8xy-(x²y+y²x)]](/uploads/image/z/1662938-26-8.jpg?t=%E8%AE%A1%E7%AE%97%E4%BB%A5%E5%8F%8A%E5%8C%96%E7%AE%80%EF%BC%9A3a%26%23178%3B-%5B7a%26%23178%3B-2a-3%EF%BC%88a%26%23178%3B-a%EF%BC%89%2B1%5D%E8%BF%98%E6%9C%89%E5%91%A2%EF%BC%9A%EF%BC%888-x%26%23178%3By%2B7xy%26%23178%3B-6xy%29-%5B8xy-%28x%26%23178%3By%2By%26%23178%3Bx%29%5D)
计算以及化简:3a²-[7a²-2a-3(a²-a)+1]还有呢:(8-x²y+7xy²-6xy)-[8xy-(x²y+y²x)]
计算以及化简:3a²-[7a²-2a-3(a²-a)+1]
还有呢:(8-x²y+7xy²-6xy)-[8xy-(x²y+y²x)]
计算以及化简:3a²-[7a²-2a-3(a²-a)+1]还有呢:(8-x²y+7xy²-6xy)-[8xy-(x²y+y²x)]
3a²-[7a²-2a-3(a²-a)+1]
=3a²-【7a²-2a-3a²+3a+1】
=3a²-4a²-a-1
=-a²-a-1
(8-x²y+7xy²-6xy)-[8xy-(x²y+y²x)]
=8-x²y+7xy²-6xy-8xy+x²y+xy²
=8+8xy²-14xy