1/5*1/6+1/6*1/7+1/7*1/8+1/8*1/9+1/9*1/10要步骤说明

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1/5*1/6+1/6*1/7+1/7*1/8+1/8*1/9+1/9*1/10要步骤说明
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1/5*1/6+1/6*1/7+1/7*1/8+1/8*1/9+1/9*1/10要步骤说明
1/5*1/6+1/6*1/7+1/7*1/8+1/8*1/9+1/9*1/10要步骤说明

1/5*1/6+1/6*1/7+1/7*1/8+1/8*1/9+1/9*1/10要步骤说明
=(6-5)/5*6+(7-6)/6*7+(8-7)/7*8+(9-8)/8*9+(10-9)/9*10
=1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=1/5-1/10
=1/10

1/n*1/(n+1)＝1/n-1/(n+1) 原式为1/10

=1/30+1/42+1/56+1/72+1/90
=2/45+1/72+7/168
=13/360+7/168
=91/2520+105/2520
=196/2520
=7/90

1,4,5,6,7, 1 2 5 6 7 (1/4+1/5+1/6+1/7)的平方-（1/4+1/5+1/6+1/7)乘(1/5+1/6+1/7)等于? 求矩阵最大特征根特征向量[1 5/7 5/6 5 5/27/5 1 6/7 7 7/26/5 6/7 1 6 31/5 1/7 1/6 1 1/22/5 2/7 1/3 2][1 5/7 5/6 5 5/2 7/5 1 6/7 7 7/26/5 6/7 1 6 31/5 1/7 1/6 1 1/22/5 2/7 1/3 2 1] 1/6+9/7+5/6＝? （简单运算）(4+1/5+1/6+1/7)*(1/5+1/6+1/7+1/8)-(4+1/5+1/6+1/7+1/8)*(1/5+1/6+1/7)星号是乘号 1、6、7、8. 1,6,7,43（ 6 7 8 1 1 2 7 6 7 ( ) 1×2+5-6+7+1×0+5+1=? 1/4×5+1/5×6+1/6×7+1/7×8= 1/2 × 1/5 +1/3 ×1/6+1/4×1/7+1/5×1/8+1/6×1/9+1/7×1/10 ((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) 5×6×7/1+6×7×8/1+7×8×9/1求简便方法 1/5*6*7+1/6*7*8+1/7*8*9分数 1/3*4+1/4*5+1/5*6+1/6*7+.1/99*100=? 1/2+1/3+1/4+1/5+1/6+1/7+.1/20=