1/1*2*3+1/2*3*4+1/3*4*5.1/99*100*101
1/1*2*3+1/2*3*4+1/3*4*5.1/99*100*101
1/1*2+1/2*3+1/3*4+1/4*5.1/99*100=
1*1-2*2+3*3-4*4+...+99*99-100*100+101*101
1/1*2*3+1/2*3*4+1/3*4*5+...+1/99*100*101
1/1*2*3+1/2*3*4+1/3*4*5+.1/99*100*101
1/101+2/101+3/101+4/101+.+98/101+99/101+99/101
1,2,3,...,99,100; 2,3,4,...,100,101; 4,5,6,...,101,102;...10
(1+1/1*3)*(1+1/2*4)*(1+1/3*5).(1+1/98*100)*(1+1/99*101)
(1+1/1+3)*(1+1/2*4)*(1+1/3*5)*.*(1+1/98*100)*(1+1/99*101)
1-2+3-4+5...+99-100+101=?
1-2+3-4+5-6+...+99-100+101求值
1+(-2)+(+3)+(-4)+(+5)+(-6).(+99)+(-100)+(101)