作业帮1/3*5+1/5*7+······+1/97*99+1/99*101=?
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1/3*5+1/5*7+······+1/97*99+1/99*101=?
1/3*5+1/5*7+······+1/97*99+1/99*101=?
1/3*5+1/5*7+······+1/97*99+1/99*101=?
1/1*3+1/3*5+1/5*7+.+1/99*100-1/1*3 =1/2[( 1-1/3)+(1/3-1/5)+(1/5-1/7)+.+(1/99-1/100)]-1/1*3 =1/2( 1-1/3+1/3-1/5+1/5-1/7+.+1/99-1/100)-1/1*3 =1/2(1-1/100)1-1/1*3 =99/200-1/1*3 =74/150
1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
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
计算1-3+5-7+9-11+··········+97-99=
将下列每个3*3正方形内的九格以及横竖九格均填入一至九的数字,且不重复.· 8 9 · 2 ··1··· 1 ··· 3······· 6 7········· 8 2·········5 ···· 7 ··············· 9 8 ····7 ·
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全部属于裸子植物的是 1卷柏 2侧柏 3银杏 4刺槐 5苏铁 6梧桐 7云杉 8贯从 9珙桐 A1237 B2357 C2379 D1358贯从是贯众·······························
计算1/（1*4）+1/（4*7）+1/（7*10)+------+1/(97*100)································································································
2011红领巾快乐数独答案一2·····4·9·631·4·8·8··97··3··3··2·95···95·86···15·3··7··9··47··5·7·3·182·3·4·····7二7·1·8·3·····413·6·2·6···4·8·8·5·1·2·61·····94·2·9·4·7·8·
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
变态数学题·······方程一道············x+2y+3z=1x=y+12x+3y+5z=2方程组············要过程············我解了之后总觉得无解·····
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+···+2005+2007+2009等于多少?要有过程····快·····
（1+3+5++7+9······+2011）-（2+4+6+8······+2012）=
1*3*5*7*9*······*99=?注：*表示乘号,······表示省略号.
计算:1/1·5+1/3·7+1/5·9+···+1/21·25
-1-3-5-7-9······-97-99怎么计算
1-3+5-7+9-11······+2009-2011+2013-2015