作业帮1/4+1/12+1/24+1/40+1/60+1/84+1/112能不能说清楚些
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1/4+1/12+1/24+1/40+1/60+1/84+1/112能不能说清楚些
1/4+1/12+1/24+1/40+1/60+1/84+1/112
能不能说清楚些
1/4+1/12+1/24+1/40+1/60+1/84+1/112能不能说清楚些
1/4+1/12+1/24+1/40+1/60+1/84+1/112
=1/2*(1/2+1/6+1/12+1/20+1/30+1/42+1/56)
=1/2*(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)
=1/2*(7/8)
=7/16
1/4+1/12+1/24+1/40+1/84+1/112+1/144+1/180
巧算1/4+1/12+1/24+1/40+1/60+1/84+1/112
简算!4分之1+12分之1+24分之1+40分之1+60分之1
4分之1+1/12+1/24+1/40…+1/19800
1/4+1/12+1/24+1/40……+1/19800=?
4/1+12/1+24/1+40/1+.19800/1
如何巧算1/4+1/12+1/24+1/40+.+1/19800
1/4+1/12+1/24+1/40+……+1/19800=?
巧算1/4+1/12+1/24+1/40+1/60+1/84+1/112求详细过程
1/4+1/12+1/24+1/40+1/60+1/84+1/112能不能说清楚些
1/12+1/24+1/40+1/60+1/84+1/112+1/144+1/180
1/4+1/12+1/24+1/40.+1/19800
计算：4分之1+12分之1+24分之1+40分之1+60分之1+...+180分之1=?
4分之1+12分之1+24分之1+40分之1+60分之1+...+180分之1=?快
1/6,1/6,1/12,1/24,( ) A 1/48 B 1/28 C 1/40 D 1/24
1/4+1/12+1/24+...+1/180 简便算法
计算1/4+1/12+1/24+1/40+···+1/180,过程也写一下、教教
(1/24 + 1/30 + 1/40) * 12 - 1/30 * x = 1怎么解