(1/3)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42)
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(1/3)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42)(1/3)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42)(1/3)-(1/6)-(1/12)-(1/
(1/3)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42)
(1/3)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42)
(1/3)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42)
(1/3)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42)
=1/3-[(1/6)+(1/12)+(1/20)+(1/30)+(1/42)]
=1/3-[1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6]
=1/3-[1/2-1/6]
=1/3-[3/6-1/6]
=1/3-2/6
=1/3-1/3
=0
计算：1/6-(+1/3)-(-1/12)
1/3+1/6+1/9+1/12+1/15
1+12+3+45+6
48*(1/12+1/6-3/4)
(-1/6+3/4-1/12)*(-48)
1/3+1/6+1/12+...+1/9900
1/3-1/6-1/12-1/24 简便计算方法
1/(1*3) + 1/(3*6) + 1/(6*9) + 1/(9*12) + …+1/(96*99)
1/3+1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+1/(3+6+9+12+15)+.1/(3+6+9+12+15+.96+99)
1/3+1/3+1/6+1/12+1/24+1/48+1/96
1/3+1/(3+6)+1/(3+6+9)+1/(3+6+9+12).+1/(3+6+9+.+99)
1/2+1/3+1/4+1/6+1/12+1/48+1/56
计算:1/3*6+1/6*9+1/9*12+.1/3n(3n+3)
(-1/12-1/36+3/4-1/6)×(-48)
(3/4-1/6-1/12-1/36)×(-48)
(-1/12-1/36+3/4-1/6)*(-48)
3/(a+1)-12/(a²-1)-6/(1-a)
(-1/6-1/16+3/4-1/12)*(-45)