题目内容
计算(能简算的要简算) (
| (
|
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|
|
|
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法分配律进行简算;
(2)先算加法,再算乘法;
(3)先算减法,再算乘法;
(4)先算乘法,再算减法;
(5)按照从左向右的顺序进行计算;
(6)根据乘法分配律进行简算.
(2)先算加法,再算乘法;
(3)先算减法,再算乘法;
(4)先算乘法,再算减法;
(5)按照从左向右的顺序进行计算;
(6)根据乘法分配律进行简算.
解答:
解:(1)(
-
)×24
=
×24-
×24
=8-3
=5;
(2)(
+
)×
=
×
=
;
(3)
×(
-
)
=
×
=
;
(4)
-
×
=
-
=
;
(5)
×
×
=
×
=
;
(6)
×
+
×
=
×
+
×
=
×(
+
)
=
×
=
.
1 |
3 |
1 |
8 |
=
1 |
3 |
1 |
8 |
=8-3
=5;
(2)(
3 |
4 |
1 |
12 |
3 |
5 |
=
5 |
6 |
3 |
5 |
=
1 |
2 |
(3)
3 |
4 |
9 |
10 |
5 |
6 |
=
3 |
4 |
1 |
15 |
=
1 |
20 |
(4)
7 |
16 |
4 |
15 |
9 |
16 |
=
7 |
16 |
3 |
20 |
=
23 |
80 |
(5)
3 |
4 |
5 |
15 |
5 |
12 |
=
1 |
4 |
5 |
12 |
=
5 |
48 |
(6)
2 |
7 |
3 |
5 |
2 |
5 |
4 |
7 |
=
2 |
7 |
3 |
5 |
4 |
5 |
2 |
7 |
=
2 |
7 |
3 |
5 |
4 |
5 |
=
2 |
7 |
7 |
5 |
=
2 |
5 |
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定律简便计算.
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