1/20+1/30+1/42+1/56怎么巧算?等于多少?急啊!1 8 27 ( ) 125 ( )
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1/20+1/30+1/42+1/56怎么巧算?等于多少?急啊!1827()125()1/20+1/30+1/42+1/56怎么巧算?等于多少?急啊!1827()125()1/20+1/30+1/42
1/20+1/30+1/42+1/56怎么巧算?等于多少?急啊!1 8 27 ( ) 125 ( )
1/20+1/30+1/42+1/56怎么巧算?等于多少?急啊!
1 8 27 ( ) 125 ( )
1/20+1/30+1/42+1/56怎么巧算?等于多少?急啊!1 8 27 ( ) 125 ( )
1/20+1/30+1/42+1/56
=1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1/4-1/8
=1/8
很高兴能帮到亲,
1/20+1/30+1/42+1/56
=1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1/4-1/8
=1/8
=1/10(1/2+1/3)+1/14(1/3+1/4)
1/10x5/6+1/14x7/12
=1/12+1/24
=3/24
=1/8
1/20+1/30+1/42+1/56简便计算,
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+1/56+1/72
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 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
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+1/42+1/56=
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