题目内容
计算.
|
|
(
|
|
分析:(1)先算乘法,再算减法;
(2)根据乘法分配律进行计算;
(3)先算括号里用的,最后再算除法;
(4)先算括号里面的乘法,再算括号里面的加法,最后算除法.
(2)根据乘法分配律进行计算;
(3)先算括号里用的,最后再算除法;
(4)先算括号里面的乘法,再算括号里面的加法,最后算除法.
解答:解:(1)
-
×
,
=
-
,
=
;
(2)
×
+
×
,
=
×(
+
),
=
×3,
=
;
(3)(
+
)÷(
-
),
=
÷
,
=5;
(4)
÷(
+
×
),
=
÷(
+
),
=
÷
,
=
.
| 3 |
| 4 |
| 4 |
| 15 |
| 5 |
| 8 |
=
| 3 |
| 4 |
| 1 |
| 6 |
=
| 7 |
| 12 |
(2)
| 2 |
| 15 |
| 5 |
| 6 |
| 13 |
| 6 |
| 2 |
| 15 |
=
| 2 |
| 15 |
| 5 |
| 6 |
| 13 |
| 6 |
=
| 2 |
| 15 |
=
| 2 |
| 5 |
(3)(
| 5 |
| 6 |
| 2 |
| 3 |
| 4 |
| 5 |
| 1 |
| 2 |
=
| 9 |
| 6 |
| 3 |
| 10 |
=5;
(4)
| 3 |
| 5 |
| 4 |
| 5 |
| 5 |
| 8 |
| 2 |
| 5 |
=
| 3 |
| 5 |
| 4 |
| 5 |
| 1 |
| 4 |
=
| 3 |
| 5 |
| 21 |
| 20 |
=
| 4 |
| 7 |
点评:本题综合考查了学生分数四则运算的计算能力,注意要认真细心.
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