题目内容
(2003?丰台区)(1)13÷(
+
)×
(2)
×[
÷(
-
)].
| 1 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
(2)
| 8 |
| 15 |
| 5 |
| 6 |
| 7 |
| 9 |
| 1 |
| 3 |
分析:(1)先通分计算出小括号内的,在从左向右依次计算;
(2)先算小括号内的在计算中括号内的,最后计算括号外面的.
(2)先算小括号内的在计算中括号内的,最后计算括号外面的.
解答:解:13÷(
+
)×
=13÷(
+
)×
,
=13÷
×
,
=12×
,
=9;
×[
÷(
-
)]
=
×[
÷(
-
)],
=
×[
÷
],
=
×
,
=1.
| 1 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
=13÷(
| 3 |
| 12 |
| 10 |
| 12 |
| 3 |
| 4 |
=13÷
| 13 |
| 12 |
| 3 |
| 4 |
=12×
| 3 |
| 4 |
=9;
| 8 |
| 15 |
| 5 |
| 6 |
| 7 |
| 9 |
| 1 |
| 3 |
=
| 8 |
| 15 |
| 5 |
| 6 |
| 7 |
| 9 |
| 3 |
| 9 |
=
| 8 |
| 15 |
| 5 |
| 6 |
| 4 |
| 9 |
=
| 8 |
| 15 |
| 15 |
| 8 |
=1.
点评:主要考查了分数的乘除法的计算法则及四则混合的运算顺序.
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