题目内容
计算下面各题(要写出计算过程)
(
|
|
(
|
|
分析:根据四则混合运算顺序,先算第二级运算,再算第一级运算,如果只有同一级运算,按照从左到右顺序计算,有括号先算括号里的解答.
解答:解:(1)(
+
)÷
+
,
=
÷
+
,
=
+
,
=1
;
(2)
+8×(
-
),
=
+8×
,
=
+
,
=1;
(3)(
-
)×
,
=
×
,
=1;
(4)
×
+
×
,
=
+
,
=
.
4 |
5 |
1 |
4 |
7 |
3 |
7 |
10 |
=
21 |
20 |
7 |
3 |
7 |
10 |
=
9 |
20 |
7 |
10 |
=1
3 |
20 |
(2)
2 |
3 |
7 |
8 |
5 |
6 |
=
2 |
3 |
1 |
24 |
=
2 |
3 |
1 |
3 |
=1;
(3)(
4 |
5 |
2 |
3 |
15 |
2 |
=
2 |
15 |
15 |
2 |
=1;
(4)
2 |
9 |
3 |
5 |
4 |
9 |
3 |
5 |
=
2 |
15 |
4 |
15 |
=
2 |
5 |
点评:本题主要考查了学生对于四则混合运算顺序知识的掌握.
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