1/3×6+1/6×9+1/9×12+····+1/45×48这题要简便计算一定要在今天回答
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1/3×6+1/6×9+1/9×12+····+1/45×48这题要简便计算一定要在今天回答1/3×6+1/6×9+1/9×12+····+1/45×48这题要简便计算一定要在今天回答1/3×6+1/
1/3×6+1/6×9+1/9×12+····+1/45×48这题要简便计算一定要在今天回答
1/3×6+1/6×9+1/9×12+····+1/45×48
这题要简便计算
一定要在今天回答
1/3×6+1/6×9+1/9×12+····+1/45×48这题要简便计算一定要在今天回答
1/3x6+1/6x9+1/9x12+.+1/45x48
解原式=1/3×（1/3-1/6+1/6-1/9+……+1/45-1/48）
=1/3×（1/3-1/48）
=1/3×15/48
=5/48
对(1/3n)*6n求和n从1到15
1/3×6+1/6×9+1/9×12+····+1/45×48
=1/3(1/3-1/6)+1/3(1/6-1/9)+1/3(1/9-1/12)+.......+1/3(1/45-1/48)
=1/3(1/3-1/6+1/6-1/9+1/9........-1/45+1/45-1/48)
=1/3(1/3-1/48)
=1/3(16/48-1/48)
=1/3 x 15/48
=5/48
1/3+1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+1/(3+6+9+12+15)+.1/(3+6+9+12+15+.96+99)
1/3×6+1/6×9+1/9×12+····+1/45×48这题要简便计算一定要在今天回答
1/3+1/(3+6)+1/(3+6+9)+1/(3+6+9+12).+1/(3+6+9+.+99)
1/3+1/6+1/9+1/12+1/15
1/(1*3) + 1/(3*6) + 1/(6*9) + 1/(9*12) + …+1/(96*99)
1/3+6+1/3+6+9+1/3+6+9+12+1/3+6+9+……+150
1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+.+1/(3+6+9+...+99)
已知1+2+3+4+···+33=17*33计算1-3+2-6+3-9+4-12+·····
(1*2*4+2*4*8+3*6*12+···+6*12*24)/1*3*9+2*6*18+3*9*27···+6*18*54=?
计算:1/3*6+1/6*9+1/9*12+.1/3n(3n+3)
3,1,6,4,9,9,12,16的规律
1/3+3+6/1+3+6+9/1+3+6+9+12/1+...+3+6+9+12+...+99/1急
一道难死人的小学奥数题1/3+1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+…+1/(3+6+9+12+…99)
大家集思广益哈 1+1/(3+6)+1/(3+6+9)+1/(3+6+9+12) +……+1/ (3+6+9+12+……300)
1+2+3-4+5+6+7-8+9+10+11-12+···+25+26+27-28=?
数列3,6,9,12,15,···的一个通项公试是a下标n+1=
求1*3*9+2*6*18+3*9*27+···+100+200+300/1*2*4+2*4*8+3*6*12+···+100*200*400的简便计算.前面是1*3*9+2*6*18+3*9*27+···+100+300+900，是分母。
-1,2,-3,4,-5,6··· 排成：-1 2 -3 4 -5 6 -7 8 -9 10 -11 12 -13 14 -15 16······第20第3个数是?