1,2,3,...,99,100; 2,3,4,...,100,101; 4,5,6,...,101,102;...100,101,102,...,198,199;

问题描述:

1,2,3,...,99,100; 2,3,4,...,100,101; 4,5,6,...,101,102;...100,101,102,...,198,199;
求下面数阵中所有数的和.

1+2+3+.+99+100=101×50=5050
100+101+.+198+199=5050+99×100= 14950
(5050+14950)×50=20000×50=1000000