999*778+333*666用简便算法怎么算,
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![999*778+333*666用简便算法怎么算,](/uploads/image/z/88830-54-0.jpg?t=999%2A778%2B333%2A666%E7%94%A8%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95%E6%80%8E%E4%B9%88%E7%AE%97%2C)
999*778+333*666用简便算法怎么算,
999*778+333*666用简便算法怎么算,
999*778+333*666用简便算法怎么算,
原式=999*778+(333*3)*(666/3)
=999*778+999*222
=999*(778+222)
=999*1000
=999000
999*778+333*666
=999*(1000-222)+333*666
=999*1000-9*111*2*111+3*111*6*111
=999*1000
=999000.
原式=999*2*389+333*6*111
=1998*(389+111)
=1998*500
=999000