问几道问题? 用简便方法计算.
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问几道问题? 用简便方法计算.
(1)5.674×37.5+375×0.4326
(4)20052005÷20042004
(6)(1+13 /1+14 /1)×(13 /1+14/1 + 15/1 )-(1+ 13/1 +14/1 + 15/1 )×(13/1 ×14/1 )
(8)1992×20052005-2005×19921992
(9)38×999
(10)578×1001
(1)5.674×37.5+375×0.4326
(4)20052005÷20042004
(6)(1+13 /1+14 /1)×(13 /1+14/1 + 15/1 )-(1+ 13/1 +14/1 + 15/1 )×(13/1 ×14/1 )
(8)1992×20052005-2005×19921992
(9)38×999
(10)578×1001
(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
=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