题目内容
| 脱式计算(能简算的要简算) (
|
| ||||||||||||||||
60÷(3+
|
(
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(
|
|
分析:(1)(3)依据分数四则运算计算方法:先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答,
(2)(4)(5)运用乘法分配律解答,
(6)运用加法交换律解答.
(2)(4)(5)运用乘法分配律解答,
(6)运用加法交换律解答.
解答:解:(1)(
-
)÷(
-
),
=
÷
,
=
;
(2)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)60÷(3+
),
=60÷3
,
=16;
(4)(
-
)×24-
,
=
×24-
×24-
,
=14-9-
,
=5-
,
=4
;
(5)(
+
-
)×48,
=
×48+
×48-
×48,
=10+28-32,
=38-32,
=6;
(6)
÷
+
+
,
=
+
+
,
=1+
,
=1
.
| 3 |
| 4 |
| 5 |
| 8 |
| 1 |
| 2 |
| 1 |
| 3 |
=
| 1 |
| 8 |
| 1 |
| 6 |
=
| 3 |
| 4 |
(2)
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
(3)60÷(3+
| 3 |
| 4 |
=60÷3
| 3 |
| 4 |
=16;
(4)(
| 7 |
| 12 |
| 3 |
| 8 |
| 5 |
| 9 |
=
| 7 |
| 12 |
| 3 |
| 8 |
| 5 |
| 9 |
=14-9-
| 5 |
| 9 |
=5-
| 5 |
| 9 |
=4
| 4 |
| 9 |
(5)(
| 5 |
| 24 |
| 7 |
| 12 |
| 2 |
| 3 |
=
| 5 |
| 24 |
| 7 |
| 12 |
| 2 |
| 3 |
=10+28-32,
=38-32,
=6;
(6)
| 1 |
| 3 |
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 3 |
=1+
| 1 |
| 3 |
=1
| 1 |
| 3 |
点评:本题主要考查学生依据四则运算计算方法,以及正确运用简便算法解决问题的能力.
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