100x100_98x98+97x97-96x96+.+2x2-1
问题描述:
100x100_98x98+97x97-96x96+.+2x2-1
答
原式=(100+99)*(100-99)+(98+97)*(98-97)+...+(2+1)*(2-1)
=100+99+98+98+...+2+1
=5050