1/8+1/24+1/48+1/80
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1/8+1/24+1/48+1/801/8+1/24+1/48+1/801/8+1/24+1/48+1/801/8+1/24+1/48+1/80=1/2×（1/2-1/4+1/4-1/6+1/6-1/
1/8+1/24+1/48+1/80
1/8+1/24+1/48+1/80
1/8+1/24+1/48+1/80
1/8+1/24+1/48+1/80
=1/2×（1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10）
=1/2×（1/2-1/10）
=1/2×4/10
=1/5
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