题目内容
计算题.
12-
÷
12÷(
+
)
12÷[
×(
-1)].
12-
| 3 |
| 5 |
| 2 |
| 3 |
12÷(
| 3 |
| 5 |
| 2 |
| 3 |
12÷[
| 3 |
| 5 |
| 4 |
| 3 |
分析:(1)先算除法,再算减法;
(2)先算括号内的,再算括号外的;
(3)先算小括号内的,再算中括号内的,最后算括号外的.
(2)先算括号内的,再算括号外的;
(3)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)12-
÷
,
=12-
×
,
=12-
,
=11
;
(2)12÷(
+
),
=12÷
,
=12×
,
=
;
(3)12÷[
×(
-1)],
=12÷[
×
],
=12÷
,
=12×5,
=60.
| 3 |
| 5 |
| 2 |
| 3 |
=12-
| 3 |
| 5 |
| 3 |
| 2 |
=12-
| 9 |
| 10 |
=11
| 1 |
| 10 |
(2)12÷(
| 3 |
| 5 |
| 2 |
| 3 |
=12÷
| 19 |
| 15 |
=12×
| 15 |
| 19 |
=
| 180 |
| 19 |
(3)12÷[
| 3 |
| 5 |
| 4 |
| 3 |
=12÷[
| 3 |
| 5 |
| 1 |
| 3 |
=12÷
| 1 |
| 5 |
=12×5,
=60.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,是解题的关键.
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