题目内容
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(
|
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|
12÷
|
14÷(
|
分析:(1)根据乘法交换律进行简算;
(2)先算加法,再算除法;
(3)先算加法,再算除法;
(4)按照从左向右的顺序进行计算;
(5)先算除法和乘法,再算加法;
(6)先算乘法,再算除法.
(2)先算加法,再算除法;
(3)先算加法,再算除法;
(4)按照从左向右的顺序进行计算;
(5)先算除法和乘法,再算加法;
(6)先算乘法,再算除法.
解答:解:
(1)
×14÷
,
=
÷
×14,
=
×14,
=2;
(2)(
+
)÷
,
=
÷
,
=
;
(3)
÷(
+
),
=
÷
,
=
;
(4)
÷
÷
,
=
÷
,
=
;
(5)12÷
+
×3,
=30+
,
=30
;
(6)14÷(
×
),
=14÷
,
=
.
(1)
| 1 |
| 8 |
| 7 |
| 8 |
=
| 1 |
| 8 |
| 7 |
| 8 |
=
| 1 |
| 7 |
=2;
(2)(
| 4 |
| 5 |
| 3 |
| 10 |
| 3 |
| 10 |
=
| 11 |
| 10 |
| 3 |
| 10 |
=
| 11 |
| 3 |
(3)
| 5 |
| 6 |
| 1 |
| 2 |
| 5 |
| 6 |
=
| 5 |
| 6 |
| 4 |
| 3 |
=
| 5 |
| 8 |
(4)
| 3 |
| 4 |
| 15 |
| 16 |
| 5 |
| 6 |
=
| 4 |
| 5 |
| 5 |
| 6 |
=
| 24 |
| 25 |
(5)12÷
| 4 |
| 10 |
| 1 |
| 6 |
=30+
| 1 |
| 2 |
=30
| 1 |
| 2 |
(6)14÷(
| 3 |
| 4 |
| 21 |
| 5 |
=14÷
| 63 |
| 20 |
=
| 40 |
| 9 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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