1-2-3+4+5-6-7+8+…+97-98-99+100.
问题描述:
1-2-3+4+5-6-7+8+…+97-98-99+100.
答
1-2-3+4+5-6-7+8+…+97-98-99+100,
=(1+4-2-3)+(5+8-6-7)+…+(97+100-98-99),
=0+0+…+0﹙共25组),
=0.