-1-(-2)-(-3)-(-4)-.-(-19)-(-20)怎样解答
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 04:39:53
![-1-(-2)-(-3)-(-4)-.-(-19)-(-20)怎样解答](/uploads/image/z/13890826-10-6.jpg?t=-1-%28-2%29-%28-3%29-%28-4%29-.-%28-19%29-%28-20%29%E6%80%8E%E6%A0%B7%E8%A7%A3%E7%AD%94)
-1-(-2)-(-3)-(-4)-.-(-19)-(-20)怎样解答
-1-(-2)-(-3)-(-4)-.-(-19)-(-20)怎样解答
-1-(-2)-(-3)-(-4)-.-(-19)-(-20)怎样解答
(1+2+...+20)-2
=21*10-2
=208
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来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 04:39:53
-1-(-2)-(-3)-(-4)-.-(-19)-(-20)怎样解答
-1-(-2)-(-3)-(-4)-.-(-19)-(-20)怎样解答
-1-(-2)-(-3)-(-4)-.-(-19)-(-20)怎样解答
(1+2+...+20)-2
=21*10-2
=208