1/23+2/23+3/23+…+21/23+22/23=
问题描述:
+1 23
+2 23
+…+3 23
+21 23
= 22 23
答
+1 23
+2 23
+…+3 23
+21 23
,22 23
=
,(1+22)×22÷2 23
=
,23×22 23×2
=11.