（1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/228）*128
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（1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/228）*128（1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/228）*128（1/8
（1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/228）*128
（1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/228）*128
（1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/228）*128
（1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/288）*128
=（1/2+1/6+1/12+1/20+1/30+1/42+14/56+1/72）*32
=（1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9）*32
=（1-1/9）*32
=8/9*32
=256/9
=(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12+1/12-1/14+1/14-1/16+1/16-1/18)*128
=(1/2-1/18)*128
=(8/18)*128
=4*128/9
=512/9请问是什么思路方便讲一下 还有个题麻烦你：2005个9*2005个9+1 2005个9这个不是靠思路，是靠经验，你...
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=(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12+1/12-1/14+1/14-1/16+1/16-1/18)*128
=(1/2-1/18)*128
=(8/18)*128
=4*128/9
=512/9
收起
1/8+1/24+1/48+1/80
1/8+1/24+1/48+1/80简便计算
(1/8+1/24+1/48+1/80+1/120+1/168+1/224)*64=
(1/8+1/24+1/48+1/80+1/120+1/168+1/224)乘64
(1/8+1/24+1/48+1/80+1/120+1/168)简便计算
（1/8+1/24+1/48+1/80+1/120+1/168）乘以56
（8/1+24/1+48/1+80/1+120//1+168/1）*42
1/8+1/24+1/48+1/80+1/120+1/168
（1/8+1/24+1/48+1/80+1/120+1/168）*56
42x(8/1+24/1+48/1+80/1+120/1+168/1)=?求求
42X（1/8+1/24+1/48+1/80+1/120+1/168）求解
8分之1+24分之1+48分之1+80分之1+120分之1=?
8/1+24/1+48/1+80/1+120/1要过程
1/8+1/24+1/48+1/80+.+1/360 =
1/8+1/24+1/48+1/80……+1/2400=?
1/2+1/8+1/24+1/48+1/80要简便哦
1/2 +1/8+1/24+1/48+1/80怎么做
1/3+1/8+1/15+1/24+1/35+1/48+1/63+1/80+1/99怎么求