1/1/10+1/11+1/12+…+1/19的整数部分是_.
问题描述:
的整数部分是______. 1
+1 10
+1 11
+…+1 12
1 19
答
1÷(
+1 10
+1 10
+…1 10
)>1÷(1 10
+1 10
+1 11
+…+1 12
)>1÷(1 19
+1 19
+1 19
+…+1 19
)1 19
即1<1÷(
+1 10
+1 11
+…+1 12
)<1 19
19 10
因此,1÷(
+1 10
+1 11
+…+1 12
)的整数部分是1;1 19
故答案为:1