(1+3+5...+997+999)-(2+4+6+8.+998+1000)

来源:学生作业帮助网 编辑:六六作业网 时间:2024/10/05 05:04:38
(1+3+5...+997+999)-(2+4+6+8.+998+1000)(1+3+5...+997+999)-(2+4+6+8.+998+1000)(1+3+5...+997+999)-(2+4+

(1+3+5...+997+999)-(2+4+6+8.+998+1000)
(1+3+5...+997+999)-(2+4+6+8.+998+1000)

(1+3+5...+997+999)-(2+4+6+8.+998+1000)
=(1-2)+(3-4)+...+(999-1000)
=-1-1-1...-1
=-500

(1+3+5...+997+999)-(2+4+6+8....+998+1000)= -500

=(1-2)+(3-4)+.......+(999-1000)
共有500组