简便计算:(-2007)×(-53 又 51/52)+1678×(-53又51/52)-329×53 又 51/52

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  • (-2007)×(-53 又 51/52)+1678×(-53又51/52)-329×53 又 51/52

    =(-2007+1678+329)×(-53 又 51/52)

    =0×(-53 又 51/52)

    =0

    a★b=-a×b-(a+b),

    3★4即a=3,b=4

    3★4=3×4-(3+4)=5

    所以(3★4)★(-5)

    =5★(-5)

    =5×(-5)-[5+(-5)]

    =-25-0

    =-25