1/(1*3) + 1/(3*6) + 1/(6*9) + 1/(9*12) + …+1/(96*99)
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1/(1*3)+1/(3*6)+1/(6*9)+1/(9*12)+…+1/(96*99)1/(1*3)+1/(3*6)+1/(6*9)+1/(9*12)+…+1/(96*99)1/(1*3)+1/(3
1/(1*3) + 1/(3*6) + 1/(6*9) + 1/(9*12) + …+1/(96*99)
1/(1*3) + 1/(3*6) + 1/(6*9) + 1/(9*12) + …+1/(96*99)
1/(1*3) + 1/(3*6) + 1/(6*9) + 1/(9*12) + …+1/(96*99)
1/(1*3) + 1/(3*6) + 1/(6*9) + 1/(9*12) + …+1/(96*99)
=1/3 + 1/3*(1/3-1/6+1/6-1/9 + .-1/96+1/96-1/99 )
=1/3 + 1/3*(1/3-1/99)
=1/3*(1+1/3-1/99)
=395/27
数学题1/3+1/6+1/6+1/3=1/3x()+1/6x()
1/6：2/3
计算：1/6-(+1/3)-(-1/12)
1/6,1/3,1,4,20,()
(1/3-1/6+3/8)*24
1+1/3+1/6+1/10+...+1/5050越快越好,
1+1-1+1-1*6%3%51*
1/3+1/6+1/10+1/5+.+1/5050
1/3+1/6+1/10+1/5+.+1/5050
计算：（-1）-[1-(1-1/2*1/3)]*6
计算!（-1）-[1-(1-1/2*1/3)]*6
1/3+1/6+1/9+1/12+1/15
1/3+1/(3+6)+1/(3+6+9)+1/(3+6+9+12).+1/(3+6+9+.+99)
1+1+1+1+1-5+5-5+1+1-2+3+3+3+3-6-3-3等于多少?
（1- 1/100)(1- 1/99) .....(1- 1/4)(1- 1/3)(1- 1/2) (-1 1/2)*(-1 1/3)*......(-1 1/6)*(-1 1/7)
本人菜鸟3 1 1 1 6 1 1 11 3 1 1 = 6 3 1 11 1 3 1 6 1 3 11 1 1 3 6 1 1 3证明4x4=4x4的矩阵
1/(1*3) + 1/(3*6) + 1/(6*9) + 1/(9*12) + …+1/(96*99)
计算:1/3*6+1/6*9+1/9*12+.1/3n(3n+3)