问几道问题? 用简便方法计算.(1)5.674×37.5+375×0.4326 (4)20052005÷20042004

1个回答

  • (1)5.674×37.5+375×0.4326

    =5.674×37.5+(375÷10)*(0.4326*10)

    =5.674×37.5+37.5*4.326

    =37.5*(5.674+4.326)

    =37.5*10

    =375.

    (2)20052005÷20042004

    =2005*10001/2004*10001

    =2005/2004

    (8)1992×20052005-2005×19921992

    =1992*2005*10001-2005*1992*10001

    =0

    (9)38×999

    =38*(1000-1)

    =38*1000-38

    =……

    (10)578*1001

    =578*(1000+1)

    =578*1000+578

    =……

    (6)不晓得