题目内容
简便运算
×125×
×8
+
+
-
×
+
÷5.
| 1 |
| 4 |
| 1 |
| 25 |
| 4 |
| 7 |
| 3 |
| 5 |
| 3 |
| 7 |
| 2 |
| 5 |
| 5 |
| 7 |
| 4 |
| 5 |
| 5 |
| 7 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)根据乘法交换律和结合律进行简算;
(2)根据加法交换律和结合律进行简算;
(3)根据乘法分配律进行简算.
(2)根据加法交换律和结合律进行简算;
(3)根据乘法分配律进行简算.
解答:
解:(1)
×125×
×8
=(
×8)×(125×
)
=2×5
=10;
(2)
+
+
-
=(
+
)+(
-
)
=1+
=1
;
(3)
×
+
÷5
=
×
+
×
=
×(
+
)
=
×1
=
.
| 1 |
| 4 |
| 1 |
| 25 |
=(
| 1 |
| 4 |
| 1 |
| 25 |
=2×5
=10;
(2)
| 4 |
| 7 |
| 3 |
| 5 |
| 3 |
| 7 |
| 2 |
| 5 |
=(
| 4 |
| 7 |
| 3 |
| 7 |
| 3 |
| 5 |
| 2 |
| 5 |
=1+
| 1 |
| 5 |
=1
| 1 |
| 5 |
(3)
| 5 |
| 7 |
| 4 |
| 5 |
| 5 |
| 7 |
=
| 5 |
| 7 |
| 4 |
| 5 |
| 5 |
| 7 |
| 1 |
| 5 |
=
| 5 |
| 7 |
| 4 |
| 5 |
| 1 |
| 5 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
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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