题目内容
| 1 |
| 97 |
| 2 |
| 97 |
| 3 |
| 97 |
| 9 |
| 97 |
| 45 |
| 97 |
| 45 |
| 97 |
分析:运用加法交换律和结合律进行简算.
解答:解:
+
+
+…+
,
=(
+
)+(
+
)+(
+
)+(
+
)+
,
=
×4+
,
=
+
,
=
;
故答案为:
.
| 1 |
| 97 |
| 2 |
| 97 |
| 3 |
| 97 |
| 9 |
| 97 |
=(
| 1 |
| 97 |
| 9 |
| 97 |
| 2 |
| 97 |
| 8 |
| 97 |
| 3 |
| 97 |
| 7 |
| 97 |
| 4 |
| 97 |
| 6 |
| 97 |
| 5 |
| 97 |
=
| 10 |
| 97 |
| 5 |
| 97 |
=
| 40 |
| 97 |
| 5 |
| 97 |
=
| 45 |
| 97 |
故答案为:
| 45 |
| 97 |
点评:此题考查的目的是小数灵活运用运算定律和运算性质进行简便计算.
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