2007×2007/2008-1002×(-1003/1004)用简便方法计算

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2007×2007/2008-1002×(-1003/1004)用简便方法计算
2007×2007/2008-1002×(-1003/1004)用简便方法计算

2007×2007/2008-1002×(-1003/1004)用简便方法计算
2007×2007/2008-1002×(-1003/1004)
=(2008-1)×2007/2008+(1004-2)×1003/1004
=2008×2007/2008-1×2007/2008+1004×1003/1004-2×1003/1004
=2007-2007/2008+1003-1003/502
=3010-2007/2008-4012/2008
=3010-6019/2008
=3007+5/2008
=3007又5/2008