题目内容
下面各题,怎么算简便就怎么算.
| 25×
| 15×
| ||||||||||||||
(
| 2÷
| 12÷
|
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)(5)(6)按照从左到右的顺序计算;
(2)(3)运用乘法交换律简算;
(4)运用乘法分配律简算.
(2)(3)运用乘法交换律简算;
(4)运用乘法分配律简算.
解答:
解:(1)
+
-
=
-
=
;
(2)25×
×
=25×
×
=15×
=
;
(3)15×
÷
=15×
×
=
×
=
;
(4)(
+
)×36
=
×36+
×36
=12+9
=21;
(5)2÷
÷
=
÷
=2;
(6)12÷
×
=16×
=
.
1 |
6 |
1 |
4 |
1 |
3 |
=
5 |
12 |
1 |
3 |
=
1 |
12 |
(2)25×
2 |
27 |
3 |
5 |
=25×
3 |
5 |
2 |
27 |
=15×
2 |
27 |
=
10 |
9 |
(3)15×
3 |
8 |
9 |
4 |
=15×
4 |
9 |
3 |
8 |
=
20 |
3 |
3 |
8 |
=
5 |
2 |
(4)(
1 |
3 |
1 |
4 |
=
1 |
3 |
1 |
4 |
=12+9
=21;
(5)2÷
8 |
5 |
5 |
8 |
=
5 |
4 |
5 |
8 |
=2;
(6)12÷
3 |
4 |
4 |
3 |
=16×
4 |
3 |
=
64 |
3 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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