1,3,7,15,(),63,()·········找规律
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1,3,7,15,(),63,()·········找规律
计算1/(1*4)+1/(4*7)+1/(7*10)+------+1/(97*100)································································································
(1+3+5++7+9······+2011)-(2+4+6+8······+2012)=
数学题1)3,5,9,17,33,( ),129,···2)1,4,9,16,( ),( ),49,( ),···3)3,7,15,31,63,( ),255,···既要速度快,也要准确(对),12分钟之内回答的我有重赏,现在是:9:24分
秦始皇和汉武帝各自的功劳是?(用1·······2·······3··········来说)
3,4,7,9,15,16,31,25,( ).( )····
1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
三角形数和正方形数的规律比如(三):1,3,6,10,15,21,……正:1,4,9,16,25··············
几道六年级找规律的题①.{1、2、3、}、{2、4、8}、{4、8、16}、()②.0、3、8、15、24、()、48······③.1、3、7、15、31、()······④. 1 4 2 9 6 3 16 12 8 4()()()()
2[4/3y—(2/3y—1/2)]=3/4y急·································!1
找规律:1、4、3、7、5、( )、( )、13、9······
1+(-3)+(-5)+7+9+(-11)+(-13)+15+···+2009+(-2011)+(-2013)+2015
1+(-3)+(-5)+7+9+(-11)+(-13)+15+···+2009+(-2011)+(-2013)+2015 =
1+2=(1+2)×2/2=3的规律?1+2= (1+2)×2/2=31+2+3=(1+3)×3/2=61+2+3+4=(1+4)×4/2=101+2+3+4+5=(1+5)×5/2=15·······································1+2+3+4+5+················n=(1+n)×
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·
到9,横竖斜相加都等于15,怎么排列4 9 2 3 5 7 8 1 6 做这道题有一个简便的办法,先写下1 2 34 5 67 8 9然后互换数字(比如2换到8的上方)···8··1··3·6··5··4··7··9···2斜着看得解.这里面有什
求(2+5+8······+2000)-(1+4+7······+1999)的值.【简算】
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 .第n行最后一个数是( )第一行:第二行:23。第三行:456.第四行:7 8 9 10 ··············第n行最后一个数是多少。