题目内容
计算:1
+3
+5
+7
+9
+11
+13
+15
+17
+19
=______.
| 3 |
| 2 |
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 16 |
| 3 |
| 32 |
| 3 |
| 64 |
| 3 |
| 128 |
| 3 |
| 256 |
| 3 |
| 512 |
| 3 |
| 1024 |
1
+3
+5
+7
+9
+11
+13
+15
+17
+19
,
=(1+3+5+..+19)+3×(
+
+
+…+
),
=102+3×(1-
),
=100+
,
=102
.
故答案为:102
.
| 3 |
| 2 |
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 16 |
| 3 |
| 32 |
| 3 |
| 64 |
| 3 |
| 128 |
| 3 |
| 256 |
| 3 |
| 512 |
| 3 |
| 1024 |
=(1+3+5+..+19)+3×(
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 1024 |
=102+3×(1-
| 1 |
| 1024 |
=100+
| 3069 |
| 1024 |
=102
| 1021 |
| 1024 |
故答案为:102
| 1021 |
| 1024 |
练习册系列答案
相关题目