题目内容
计算:
+
+
.
| 36 |
| 35 |
| 64 |
| 63 |
| 100 |
| 99 |
考点:分数的加法和减法
专题:运算顺序及法则
分析:先把
+
+
改写成1+
+1+
+1+
,进而把
+
+
改写成(
-
+
-
+
-
)÷2,再进一步计算得解.
| 36 |
| 35 |
| 64 |
| 63 |
| 100 |
| 99 |
| 1 |
| 35 |
| 1 |
| 63 |
| 1 |
| 99 |
| 1 |
| 35 |
| 1 |
| 63 |
| 1 |
| 99 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 11 |
解答:
解:
+
+
=1+
+1+
+1+
=3+(
-
+
-
+
-
)÷2
=3+(
-
)÷2
=3+
÷2
=3+
=3
.
| 36 |
| 35 |
| 64 |
| 63 |
| 100 |
| 99 |
=1+
| 1 |
| 35 |
| 1 |
| 63 |
| 1 |
| 99 |
=3+(
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 11 |
=3+(
| 2 |
| 10 |
| 1 |
| 11 |
=3+
| 6 |
| 55 |
=3+
| 3 |
| 55 |
=3
| 3 |
| 55 |
点评:此题考查分数的连加,关键是把原来的算式创造出能用简便方法计算的形式,再进一步求得结果.
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