问题
解答题
|
答案
+1+2×1 998
+1+2×2 998
+…+1+2×3 998 1+2×998 998
=998+2×(1+2+3…+998) 998
=1+2×(1+998)×998÷2 998
=1+999
=1000．
搜题请搜索小程序“爱下问搜题”
|
+1+2×1 998
+1+2×2 998
+…+1+2×3 998 1+2×998 998
=998+2×(1+2+3…+998) 998
=1+2×(1+998)×998÷2 998
=1+999
=1000．