想一想这道题用计算器计算和用简便算法计算,用简便算法应怎样算?1999-356-644=?
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![想一想这道题用计算器计算和用简便算法计算,用简便算法应怎样算?1999-356-644=?](/uploads/image/z/5176143-63-3.jpg?t=%E6%83%B3%E4%B8%80%E6%83%B3%E8%BF%99%E9%81%93%E9%A2%98%E7%94%A8%E8%AE%A1%E7%AE%97%E5%99%A8%E8%AE%A1%E7%AE%97%E5%92%8C%E7%94%A8%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95%E8%AE%A1%E7%AE%97%2C%E7%94%A8%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95%E5%BA%94%E6%80%8E%E6%A0%B7%E7%AE%97%3F1999-356-644%3D%3F)
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想一想这道题用计算器计算和用简便算法计算,用简便算法应怎样算?1999-356-644=?
想一想这道题用计算器计算和用简便算法计算,用简便算法应怎样算?1999-356-644=?
想一想这道题用计算器计算和用简便算法计算,用简便算法应怎样算?1999-356-644=?
1999-356-644
=1999-(356+644)
=1999-1000
=999
1999-356-644
=(2000-1)-(356+644)
=2000-1-1000
=1000-1
=999
1999-356-644
=1999-(356+644)
=1999-1000
=999