问题
解答题
|
答案
+1 2
+2 2
+1 2
+1 3
+2 3
+3 3
+2 3
+…+1 3
+1 100
+2 100
+…+3 100
+99 100
+100 100
+…+99 100
+2 100 1 100
=(
+1 2
+2 2
)+(1 2
+1 3
+2 3
+3 3
+2 3
)+…+(1 3
+1 100
+2 100
+…+3 100
+99 100
+100 100
+…+99 100
+2 100
)1 100
=2+3+4+…+100
=(2+100)×99÷2
=5049.