作业帮1/6+1/24+1/48/+1/120+1/210+1/336+1/512用简便方法
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1/6+1/24+1/48/+1/120+1/210+1/336+1/512用简便方法
1/6+1/24+1/48/+1/120+1/210+1/336+1/512用简便方法
1/6+1/24+1/48/+1/120+1/210+1/336+1/512用简便方法
1/6+1/24+1/60+1/120+1/210+1/336+1/112
=(2/6+2/24+2/60+2/120+2/210+2/336+2/112)*1/2
=(1/1*2-1/2*3+1/2*3-1/3*4+1/3*4-1/4*5+1/4*5-
1/5*6+1/5*6-1/6*7+1/6*7-1/7*8+2/112)*1/2
=(1/2-1/7*8+2/112)*1/2
=(1/2-1/56+1/56)
=1/2*1/2
=1/4
简便计算：1/8+1/24+1/48+1/120
1/6+1/24+1/48/+1/120+1/210+1/336+1/512用简便方法
2/1+6/1+12/1+24/1+48/1
1/6+1/12+1/20+1/30+1/42+1/561/8+1/24+1/48+1/80+1/120
1/6+1/24+1/60+1/120+----+1/117600
(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
42*（1/8+1/24+1/48+1/86+1/120+1/168） 简便方法
1/2-1/6-24/1-1/120
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