2007×2007/2008七-1002×(-1003/1004)简便方法计算应该是2007×2007/2008-1002×(-1003/1004

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2007×2007/2008七-1002×(-1003/1004)简便方法计算应该是2007×2007/2008-1002×(-1003/1004
2007×2007/2008七-1002×(-1003/1004)简便方法计算
应该是2007×2007/2008-1002×(-1003/1004

2007×2007/2008七-1002×(-1003/1004)简便方法计算应该是2007×2007/2008-1002×(-1003/1004
2007×2007/2008-1002×(-1003/1004)
=2007*2007/2008+1002*1003/1004
=2007*(1-1/2008)+1002*(1-1/1004)
=2007-2007/2008+1002-1002/2004
=3009-(2007+2004)/2008
=3009-4015/2008
=3007又5/2008