用简便运算:1384-998、568-304
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用简便运算:1384-998、568-304
用简便运算:1384-998、568-304
用简便运算:1384-998、568-304
1384-998
=1384-(1000-2)
=1384-1000+2
=384+2
=386
568-304
=568-300-4
=268-4
=264
1384-998
=1384-(1000-2)
=1384-1000+2
=384+2
=386
568-304
=568-(300+4)
=568-300-4
=268-4
=264