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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