题目内容
脱式计算.
|
|
(
|
|
分析:(1)(2)先算小括号内的,再算中括号内的,最后算括号外的;
(3)两个括号同时计算,最后算乘法;
(4)先算乘除,再算加法.
(3)两个括号同时计算,最后算乘法;
(4)先算乘除,再算加法.
解答:解:(1)
÷[1÷(
-
)],
=
÷[1÷
],
=
÷
,
=
×
,
=
;
(2)
×[
+(
-
)],
=
×[
+
],
=
×
,
=
;
(3)(
+
)×(
+
),
=
×
,
=
;
(4)
×
+
÷
,
=
×
+
×
,
=
+
,
=
.
1 |
6 |
3 |
5 |
3 |
10 |
=
1 |
6 |
3 |
10 |
=
1 |
6 |
10 |
3 |
=
1 |
6 |
3 |
10 |
=
1 |
20 |
(2)
8 |
9 |
3 |
4 |
7 |
16 |
1 |
4 |
=
8 |
9 |
3 |
4 |
3 |
16 |
=
8 |
9 |
15 |
16 |
=
5 |
6 |
(3)(
1 |
3 |
1 |
4 |
3 |
7 |
1 |
2 |
=
7 |
12 |
13 |
14 |
=
13 |
24 |
(4)
3 |
5 |
4 |
3 |
2 |
5 |
4 |
5 |
=
3 |
5 |
4 |
3 |
2 |
5 |
5 |
4 |
=
4 |
5 |
1 |
2 |
=
13 |
10 |
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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