题目内容
计算(能简算的要简算)
|
|
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24×(
| 45×
|
|
考点:整数、分数、小数、百分数四则混合运算,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)首先计算二级运算,然后计算一级运算即可;
(2)根据乘法交换律简算即可;
(3)根据加法结合律简算即可;
(4)(5)(6)根据乘法分配律简算即可.
(2)根据乘法交换律简算即可;
(3)根据加法结合律简算即可;
(4)(5)(6)根据乘法分配律简算即可.
解答:
解:(1)
-
×
+
=
-
+
=
+
=1
(2)
-4×
÷4
=
-4÷4×
=
-
=
(3)
+(
+
×
)
=
+
+
×
=1+
=1
(4)24×(
-
+
)
=24×
-24×
+24×
=6-8+4
=2
(5)45×
=(46-1)×
=46×
-
=45-
=44
(6)
÷7+
×
=
×
+
×
=(
+
)×
=
×
=
| 1 |
| 2 |
| 1 |
| 7 |
| 7 |
| 10 |
| 5 |
| 6 |
=
| 1 |
| 2 |
| 1 |
| 10 |
| 5 |
| 6 |
=
| 2 |
| 5 |
| 5 |
| 6 |
=1
| 7 |
| 30 |
(2)
| 1 |
| 2 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 4 |
=
| 1 |
| 4 |
(3)
| 4 |
| 5 |
| 1 |
| 5 |
| 3 |
| 4 |
| 4 |
| 7 |
=
| 4 |
| 5 |
| 1 |
| 5 |
| 3 |
| 4 |
| 4 |
| 7 |
=1+
| 3 |
| 7 |
=1
| 3 |
| 7 |
(4)24×(
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 6 |
=24×
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 6 |
=6-8+4
=2
(5)45×
| 45 |
| 46 |
=(46-1)×
| 45 |
| 46 |
=46×
| 45 |
| 46 |
| 45 |
| 46 |
=45-
| 45 |
| 46 |
=44
| 1 |
| 46 |
(6)
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=(
| 8 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
点评:此题主要考查了整数、分数四则混合运算,注意运算顺序,注意乘法运算定律的应用.
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