题目内容
1
+2
+4
+6
=
| 1 |
| 10 |
| 1 |
| 40 |
| 1 |
| 88 |
| 1 |
| 154 |
考点:分数的简便计算
专题:运算定律及简算
分析:根据加法交换结合律,整数部分结合,分数部分结合.
=
×(
-
),
=
×(
-
),
=
×(
-
),
=
×(
-
),再根据乘法分配律,括号外是
,括号内相加后是
+
=
,再与括号外的
相乘等于
,再与整数部分相加即可.
| 1 |
| 10 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 40 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 8 |
| 1 |
| 88 |
| 1 |
| 3 |
| 1 |
| 8 |
| 1 |
| 11 |
| 1 |
| 154 |
| 1 |
| 3 |
| 1 |
| 11 |
| 1 |
| 14 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 14 |
| 3 |
| 7 |
| 1 |
| 3 |
| 1 |
| 7 |
解答:
解:1
+2
+4
+6
=(1+2+4+6)+(
+
+
+
)
=17+
×(
-
+
-
+
-
+
-
)
=17+
×
=17+
=17
.
| 1 |
| 10 |
| 1 |
| 40 |
| 1 |
| 88 |
| 1 |
| 154 |
=(1+2+4+6)+(
| 1 |
| 10 |
| 1 |
| 40 |
| 1 |
| 88 |
| 1 |
| 154 |
=17+
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 11 |
| 1 |
| 11 |
| 1 |
| 14 |
=17+
| 1 |
| 3 |
| 3 |
| 7 |
=17+
| 1 |
| 7 |
=17
| 1 |
| 7 |
点评:本题是考查分数的简单计算,难度大,关键是根据分母互质,分子是1的两个分数之差的分子等于分母之差,分母等于两个分母之积,把每个分数都转化为这样的两个分数之差,求出分数部分.
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