1+1/2-2-5/6+3+1/12-4-19/20+5+1/30-6-41/42+7+1/56-8-71/72+9+1/90 |1/2010-1/2009|+|1/2011-1/2010|+|1/2012-1/2011|-|1/2012-1/2009|
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1+1/2-2-5/6+3+1/12-4-19/20+5+1/30-6-41/42+7+1/56-8-71/72+9+1/90 |1/2010-1/2009|+|1/2011-1/2010|+|1/2012-1/2011|-|1/2012-1/2009|
1+1/2-2-5/6+3+1/12-4-19/20+5+1/30-6-41/42+7+1/56-8-71/72+9+1/90
|1/2010-1/2009|+|1/2011-1/2010|+|1/2012-1/2011|-|1/2012-1/2009|
1+1/2-2-5/6+3+1/12-4-19/20+5+1/30-6-41/42+7+1/56-8-71/72+9+1/90 |1/2010-1/2009|+|1/2011-1/2010|+|1/2012-1/2011|-|1/2012-1/2009|
自己再想想吧
过程没有
自己再想想吧
1/2+3/4-1/6+5/12=?
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,( )
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;1/2×3+1/3×4+1/4×5+1/5×6+1/6x7
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
2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1
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)
1+2+3+4+5+6+7+8+9+12
6-(1/2+3/4-5/12)?
12X(3/4-1/2+5/6)
100,102,104,108,()1,1,2,2,3,4,3,5,()1/72,1/36,1/12,1/6,()
1:1/5×[1/3÷(1/2+5/6)] 2:1-(1/6×2/5)÷7/9 3:12÷(1-31:1/5×[1/3÷(1/2+5/6)]2:1-(1/6×2/5)÷7/93:12÷(1-3/7)4:4/5×2/3-1/6÷1/25:(1/2+1/3)÷(1-3/8)6:[(1-3/5)×2/3]÷4
1*2*3+2*3*4+3*4*5+5*6*7+.10*11*12
1*2*3+2*3*4+3*4*5+5*6*7+.10*11*12
5/12-1/6+2/3=?