1/20+1/30+1/42+1/56简便计算,
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1/20+1/30+1/42+1/56简便计算,1/20+1/30+1/42+1/56简便计算,1/20+1/30+1/42+1/56简便计算,解原式=(1/4-1/5)+(1/5-1/6)+(1/6
1/20+1/30+1/42+1/56简便计算,
1/20+1/30+1/42+1/56
简便计算,
1/20+1/30+1/42+1/56简便计算,
解
原式
=(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
=1/4+(1/5-1/5)+(1/6-1/6)+(1/7-1/7)-1/8
=1/4-18
=1/8
3/4+1/20+1/30+1/42+1/56+1/72
=(1-1/4)+(1/4-1/5)+(1/5-1/6)+(6/1-1/7)+(1/7-1/8)+(1/8-1/9)
=1-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1-1/9
=8/9
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简算题1/2+1/6+1/12+1/20+1/30+1/42+1/56
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12分之1+20分之1+30分之1+42分之1+56分之1,这道题怎么简算?
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
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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,
1/12+1/20+1/30+1/42+1/56+1/72+1/90
简便运算:1/2+1/6+1/12+1/20+1/30+1/42+1/56
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
1/12+1/20+1/30+1/42+1/56+1/72+1/90
1/6+1/12+1/20+1/30+1/42+1/56+1/72 简便计算
1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56怎么算