1*2+2*3+3*4+4*5.99*100+100*101
1*2+2*3+3*4+4*5.99*100+100*101
1+1+2+2+3+3+4+4+5+5.99+99+100+100=?
1*1-2*2+3*3-4*4+...+99*99-100*100+101*101
1 2 3 .99 100 2 3 4 .100 101 3 4 5 .101 102 .100 101 102 .19
1,2,3,...,99,100; 2,3,4,...,100,101; 4,5,6,...,101,102;...10
1/2+1/3+2/3+4/1+2/4+3/4+.+1/101+1/101+.100/101=?
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
1/2*2/3*3*4*4/5*.*99/100*100/101=
1/1*2*3+1/2*3*4+1/3*4*5.1/99*100*101
1-2+3-4+5...+99-100+101=?
1-2+3-4+5-6+...+99-100+101求值