(1+1/2+1/3+...+1/99)×(1/2+1/3+1/4+...+1/100)—(1+1/2+1/3+1/4+...14/100)×(1/2+1/3+...+1/99)=
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(1+1/2+1/3+...+1/99)×(1/2+1/3+1/4+...+1/100)—(1+1/2+1/3+1/4+...14/100)×(1/2+1/3+...+1/99)=
(1+1/2+1/3+...+1/99)×(1/2+1/3+1/4+...+1/100)—(1+1/2+1/3+1/4+...14/100)×(1/2+1/3+...+1/99)=
(1+1/2+1/3+...+1/99)×(1/2+1/3+1/4+...+1/100)—(1+1/2+1/3+1/4+...14/100)×(1/2+1/3+...+1/99)=
令a=1/2+1/3+...+1/99
原式=(1+a)(a+1/100)-a(1+a+1/100)
=a(1+a)+1/100(1+a)-a(1+a)-1/100a
=1/100(1+a)-1/100a
=1/100+1/100a-1/100a
=1/100
1
fengfenfenfenfne
1+3+2+99
99-1+2×3
(100+99*1)+(99+99*2)+(98+99*3)+...+(2+99*99)+(1+99*100)
计算|1/2-1|+|1/3-1/2|+.+|1/99-1/98|+|1/100-1/99|
求和:|1/2-1|+|1/3-1/2|+.+|1/99-1/98|+|1/100-1/99|
|1/2-1|+|1/3-1/2|+.+|1/99-1/98|+|1/100-1/99|
(1+1/2)(1-1/2)(1+1/3)(1-1/3).(1+1/99)(1-1/99)简便算法
(1+1/2)*(1-1/2)*(1+1/3)(1-1/3).(1+1/99)*(1-1/99)
1/99+2/99+3/99+.+296/99等于多少
99/1+99/2+99/3+.99/98的值
99+99+2+1+3是多少?
1*2/1+2*3/1+3*4/1+.98*99/1+99*100/1=?
1*2/1+2*3/1+3*4/1+.98*99/1+99*100/1=?
1/1×2+1/2×3+1/3×4+.+1/98×99+1/99×100
99+99-99+1+2-3+5-2-3
1+1+2+2+3+3+.99+99+100+1000
1+1+2+2+3+3+4+.+99+99=
(1-1/2)(1-1/3)(1-1/4).(1-1/99)(1-1/100)等于?