1/2+1/6+1/20+1/30+1/42+1/56+1/72等于几?
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1/2+1/6+1/20+1/30+1/42+1/56+1/72等于几?
1/2+1/6+1/20+1/30+1/42+1/56+1/72等于几?
1/2+1/6+1/20+1/30+1/42+1/56+1/72等于几?
1/2+1/6+1/20+1/30+1/42+1/56+1/72
=1/2+1/6+1/20+1/30+1/42+1/56+1/72+1/12-1/12
=1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72-1/12
=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+1/8-1/9-1/12
=1-1/9-1/12
=8/9-1/12
=32/36-3/36
=29/36
如果还有一个1/12的话
就是
1/2=1/(1*2)=1-1/2
1/6=1/(2*3)=1/2-1/3
1/12=1/(3*4)=1/3-1/4
1/20=1/(4*5)=1/4-1/5
1/30=1/(5*6)=1/5-1/6
1/42=1/(6*7)=1/6-1/7
1/56=1/(7*8)=1/7-1/8
1/72=1/(8*9)=1/8-1/9
原式=1-1/2+1/2-1/3+……+1/7-1/8+1/8-1/9=1-1/9=8/9
2%1+6%1+12%1+20%1+30%1
1/2+1/6+1/12+1/20+1/30
1/2,-1/6,1/12,-1/20,1/30
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1+1/2+1/12+1/6+1/20+1/30+1/40+1/56
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
简便运算:1/2+1/6+1/12+1/20+1/30+1/42+1/56
1+1/2+1/6+1/12+1/20+1/30+1/42的简便计算
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56怎么算
1/2+1/6+1/12+1/20+1/30+.1/380+1/420=
1+1/2+1/6+1/12+1/20+1/30+1/42=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56
1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少
2/1+6/1+12/1+20/1+30/1+42/1+56/1=
1/2+1/6+1/12+1/20+1/30+...+1/9702+1/9900