(2+4+6+8···+996+998+1000)-(1+3+5+7+···+995+997+999)
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(2+4+6+8···+996+998+1000)-(1+3+5+7+···+995+997+999)
(2+4+6+8···+996+998+1000)-(1+3+5+7+···+995+997+999)
(2+4+6+8···+996+998+1000)-(1+3+5+7+···+995+997+999)
500
原式=(2-1)+(4-3)+…+(1000-999)=1000/2=500
500
(2+4+6+8···+996+998+1000)-(1+3+5+7+···+995+997+999)
巧算(1+3+5+7······+995+997+999)-(2+4+6+8+10·····992+994+996+99快点,急求!
(1+3+5+···+997+999)—(2+4+6+···+998+1000)
俗语和名句的填空1······,自知之明.2······,行必果.3工欲善其事,······.4临渊羡鱼,······.5非学无以广才,······.6······,福兮祸之所伏.7项庄舞剑,······.8······,人以群
1+2-3+4-5+6-7+···+998-999+100怎么写呀?
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把1 9填入81格方框,不能重复· · 4 · · 5 · 6 ·9 · · 3 · · · 5 17 · · 6 · · · · 3· · 9 · 1 6 · 4 ·· 2 · 4 · · · 8 ·· 4 · 7 · · 5 · ·5 · · · · 7 · · 84 1 · · · 8 · · 5· 8 · 9 · · 6 · 4
(2+4+6+8+······+100)—(1+3+5+7+······+99)等于几
(1+3+5++7+9······+2011)-(2+4+6+8······+2012)=
带有数字的四字词语按顺序1···2···3···4···5···6···7···8···9···10···祝福语
计算:(2+4+6+8+···+100)-(1+3+5+···+99)
2-4+6-8+······+2002-2004+2006= 等于几?
2+4+6+8+10+······+100=?
计算:2+4+6+8+······+2000
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