(1)996+997+998+999+10 =996+4+(997+3)+(999+1)+(998+2) =4000 |
(2)583-214-186 =583-(214+186) =183 |
(3)1794+(825-794) =1794-794+825 =1825 |
(4)238+199+262 =238+262+199 =699 |
(5)2008-2007+2006-2005+2004-2003+2002-2001 =(2008-2007)+(2006-2005)+(2004-2003)+(2002-2001) =4 |