1/2+1/6+1/12+...+1/56=快
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1/2+1/6+1/12+...+1/56=快1/2+1/6+1/12+...+1/56=快1/2+1/6+1/12+...+1/56=快1/2+1/6+1/12+...+1/56=1/2+1/(2*
1/2+1/6+1/12+...+1/56=快
1/2+1/6+1/12+...+1/56=
快
1/2+1/6+1/12+...+1/56=快
1/2+1/6+1/12+...+1/56
=1/2+1/(2*3)+1/(3*4)+……+1/(7*8)
=1/2+(3-2)/(2*3)+……+(8-7)/(8*7)
=1/2+1/2-1/3+1/3-1/4+……+1/7-1/8
=1-1/8
=7/8
2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1
找规律填空:1/12,1/6,1/4,1/3,5/12,1/2,().
按规律写数:1/12,1/6,1/4,1/3,5/12,1/2,( )
递等式计算 1/2-1/3+1/4-1/5+1/6-1/12
1/2-1/3+1/4-1/5+1/6-1/12
简便计算下题.1/2-1/3+1/4-1/5+1/6-1/12
1/2,1/3,5/6,( ),12/6,( )
1/2+1/6+1/12+1/20+1/30;1/2×3+1/3×4+1/4×5+1/5×6+1/6x7
5/12-1/6+2/3=?
】-(-2又1/6)÷(-5/12)
1+(-2)+|-2-3|-5 (1/4-1/16-1/6+1/12)x(-48) 这两题
1/2 + 1/6 + 1/12 + 1/20 + 1/30+ 1/42 + 1/56 + 1/72=(1+ 1/2+ 1/3+ 1/4+ 1/5)×(1/2+ 1/3+ 1/4+ 1/5+ 1/6)-(1+ 1/2+ 1/3+ 1/4+1/5+ 1/6)×(1/2+ 1/3+ 1/4+ 1/5)
5 ( ) ( ) ( ) ( ) 12 ( ) ( ) ( ) ( ) ( )6 ( ) ( ) ( ) ( ) ( )( ) 5 ( ) ( ) ( ) ( )( ) ( ) ( ) ( ) ( ) ( )1 ( ) ( ) ( ) ( ) ( )
计算(+5/2)-(-5/3)=-5/1(-5/2)-(-5/3)=5/12/1-3/1=6/1(-2/1)-3/1=-6/1
1/2+1/6+1/12+1/20.+1/380
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-...-1/110