如题所述
1)äºåäºåäºåäºåä¹åä¸Ã79.45+159Ã47.56+ä¸åä¹åäºååä¹åä¸Ã52.44
=52.44Ã79.45+159Ã47.56+79.55Ã52.44
=52.44Ã(79.45+79.55)+159Ã47.56
=52.44Ã159+159Ã47.56
=159Ã(52.44+47.56)
=159Ã100
=15900
3)2002+2001-2000-1999+1998+1997-1996-1995+â¦â¦+2+1
=(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+â¦â¦+(6-4)+(5-3)+2+1
=2+2+2+2+â¦â¦+2+2(ä»3-2002å ±2000个æ°ï¼æ以æ1000个2)+2+1
=1000Ã2+2+1
=2003
=52.44Ã79.45+159Ã47.56+79.55Ã52.44
=52.44Ã(79.45+79.55)+159Ã47.56
=52.44Ã159+159Ã47.56
=159Ã(52.44+47.56)
=159Ã100
=15900
3)2002+2001-2000-1999+1998+1997-1996-1995+â¦â¦+2+1
=(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+â¦â¦+(6-4)+(5-3)+2+1
=2+2+2+2+â¦â¦+2+2(ä»3-2002å ±2000个æ°ï¼æ以æ1000个2)+2+1
=1000Ã2+2+1
=2003
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第1个回答 2016-07-02
0.5x1/2=
0.1+1/2=
0.1+1/2=