题目内容
(2008?塘沽区)脱式计算
(1-
|
|
|
|
分析:(1)先算括号内的,再算括号外的;
(2)(4)先算小括号内的,再算中括号内的,最后算括号外的;
(3)先算括号外的乘法和括号内的,再算除法.
(2)(4)先算小括号内的,再算中括号内的,最后算括号外的;
(3)先算括号外的乘法和括号内的,再算除法.
解答:解:(1)(1-
-
)÷
,
=
÷
,
=
×
,
=
;
(2)
×[
÷(
+
)],
=
×[
÷
],
=
×[
×
],
=
×
,
=
;
(3)
×
÷(
-
),
=
÷
,
=
×12,
=
;
(4)
÷[
-(
+
)],
=
÷[
-
],
=
÷
,
=1.
| 1 |
| 4 |
| 5 |
| 12 |
| 2 |
| 3 |
=
| 1 |
| 3 |
| 2 |
| 3 |
=
| 1 |
| 3 |
| 3 |
| 2 |
=
| 1 |
| 2 |
(2)
| 8 |
| 9 |
| 3 |
| 7 |
| 2 |
| 3 |
| 1 |
| 7 |
=
| 8 |
| 9 |
| 3 |
| 7 |
| 17 |
| 21 |
=
| 8 |
| 9 |
| 3 |
| 7 |
| 21 |
| 17 |
=
| 8 |
| 9 |
| 9 |
| 17 |
=
| 8 |
| 17 |
(3)
| 1 |
| 6 |
| 2 |
| 5 |
| 5 |
| 6 |
| 3 |
| 4 |
=
| 1 |
| 15 |
| 1 |
| 12 |
=
| 1 |
| 15 |
=
| 4 |
| 5 |
(4)
| 1 |
| 4 |
| 7 |
| 8 |
| 3 |
| 8 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 7 |
| 8 |
| 5 |
| 8 |
=
| 1 |
| 4 |
| 1 |
| 4 |
=1.
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.
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