(1/5+1/6)-(1/6-1/7)-(1/7-1/8)-(1/8-1/9)-(1/9-1/10)简便运算,

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? 1/6+9/7+5/6＝? 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] 1×2+5-6+7+1×0+5+1=? （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 1/3*4+1/4*5+1/5*6+1/6*7+.1/99*100=? 1/4×5+1/5×6+1/6×7+1/7×8= ((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) 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+5x=6 1+6x=7 1/2+1/3+1/4+1/5+1/6+1/7+.1/20= [-5]*[-7]-5/[-6分之1】 5-1-1-7-2-1-8-6=? 1/5-1/6 7/8-1/4 计算：1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9 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