1/4-1/20-1/30-1/42-1/56-1/72简便计算怎么做开学要用
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1/4-1/20-1/30-1/42-1/56-1/72简便计算怎么做开学要用1/4-1/20-1/30-1/42-1/56-1/72简便计算怎么做开学要用1/4-1/20-1/30-1/42-1/5
1/4-1/20-1/30-1/42-1/56-1/72简便计算怎么做开学要用
1/4-1/20-1/30-1/42-1/56-1/72简便计算怎么做
开学要用
1/4-1/20-1/30-1/42-1/56-1/72简便计算怎么做开学要用
1/4-1/20-1/30-1/42-1/56-1/72
=1/4-1/4*5-1/5*6-1/6*7-1/7*8-1/8*9
=1/4-(1/4-1/5)-(1/5-1/6)-(1/6-1/7)-(1/7-1/8)-(1/8-1/9)
=1/4-1/4+1/5-1/5+1/6-1/6+1/7-1/7+1/8-1/8+1/9
=1/9
1-1/4+1/20+1/30+1/42+1/56简便计算哦
1/6+1/12+1/20+1/30+1/42
1/3-1/12-1/20-1/30-1/42
1／6+1／12+1／20+1／30+1／42
1/12+1/20+1/30+1/42+.+1/2450
4,2,1,1/2,1/4,（ ) ( ) ( )1/8,1/32,1/4 ,1/16( )( ) ( )1/2,1/6,1/12,1/20,1/30,1/42 ( ) ( ) ( )
1/20+1/30+1/42+1/56简便计算,
1/20+1/30+1/42+……+1/132
1/20+1/30+1/42+.+1/132=?
1/20+1/30+1/42+1/56=1/20+1/30+1/42+1/56=
1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42=?1/2+1/4+1/8+1/16+1/32+1/64=?
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.简便计算 1/2+1/6+1/12+1/20+1/30+1/42 3.65/0.25+1.35*4
1/4-1/20-1/30-1/42-1/56-1/72简便计算怎么做开学要用
1-4分之1+20分之1+30分之1+42分之1+56分之1简便计算
1/4 - 1/20 - 1/30 - 1/42 - 1/56 - 1/72 请分步解答,说明方法.
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算