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2AB-粮克短3A+3B+2031=2(AB)-3(A-B)些帮钟功田属编色小+2031=2(-1)-3*5来自+2031=-2-15+2031=2014无副题
解:原式=2AB-3A+3B+2031
2AB-3A+3B+2031=2(AB)-3(A-B)+2031=2(-1)-3*5+2031=-2-15+2031=2014是这样吗?