1/1*7+1/2*8+1/3*9~1/10*16
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1/1*7+1/2*8+1/3*9~1/10*161/1*7+1/2*8+1/3*9~1/10*161/1*7+1/2*8+1/3*9~1/10*161/1*7+1/2*8+1/3*9~1/10*16
1/1*7+1/2*8+1/3*9~1/10*16
1/1*7+1/2*8+1/3*9~1/10*16
1/1*7+1/2*8+1/3*9~1/10*16
1/1*7+1/2*8+1/3*9~1/10*16
=1/6(1-1/7)+1/6(1/2-1/8)+1/6(1/3-1/9)+...+1/6(1/10-1/16)
=1/6(1-1/7+1/2-1/8+1/3-1/9+...+1/10-1/16)
=1+1/2+1/3+1/4+1/5+1/6-1/11-1/12-1/13-1/14-1/15-1/16
=
((1/2)-1)*((1/3)-1)*((1/4)-1)*((1/5)-1)*((1/6)-1)*((1/7)-1)*((1/8)-1)*((1/9)-1)*((1/10)-1)
9*(1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*(1-1/6)*(1-1/7)*(1-1/8)*(1-1/9)怎样简便计算
计算 (1+1/2)×(1+1/3)×(1+1/4)×……×(1+1/7)×(1+1/8)×计算 (1+1/2)×(1+1/3)×(1+1/4)×……×(1+1/7)×(1+1/8)×(1+1/9)
化简:1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10
1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10等于多少?
用放缩法 求证1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9
2/1+2/1*3/1+3/1*4/1+4/1*5/1+5/1*6/1+6/1*7/1+7/1*8/1+8/1*9/1+9/1*10/1的答案是多少?
1+2+3+9+8+7
2+8+3+7+1+9=?
1/2 × 1/5 +1/3 ×1/6+1/4×1/7+1/5×1/8+1/6×1/9+1/7×1/10
数列计算 1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9=?数列计算 1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9=?1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10=?最主要的是怎么计算的过程。
数列计算 1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9=?
1/2×1/3+1/3×1/4+1/4×1/5+1/5×1/6+1/6×1/7+1/7×1/8+1/8×1/9+1/9×1/10=?希望把过程写出来
1/1*7+1/2*8+1/3*9~1/10*16
1/1*7+1/2*8+1/3*9~1/10*16
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=1-1/2+1/2-1/3+1/3-1/4+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为什么呢?写出解析.
(-1-1/2)*(-1-1/3)*(-1-1/4)*(-1-1/5)*(-1-1/6)*……*(-1-1/9)*(-1-1/10)(-1-1/2)*(-1-1/3)*(-1-1/4)*(-1-1/5)*(-1-1/6)*(-1-1/7)*(-1-1/8)*(-1-1/9)*(-1-1/10)
计算题1-1/2-1/3+1/4+1/5-1/6-1/7+1/8+1/9……-1/2006-1/2007+1/2008+1/2009-1/20101-1/2-1/3+1/4+1/5-1/6-1/7+1/8+1/9……-1/2006-1/2007+1/2008+1/2009-1/2010=麻烦你了,