题目内容
计算下面各题,能简算的请简算.
(
|
| 5
|
考点:分数的简便计算
专题:运算定律及简算
分析:(1)根据乘法分配律进行简算;
(2)根据乘法分配律进行简算;
(3)根据减法的性质进行简算.
(2)根据乘法分配律进行简算;
(3)根据减法的性质进行简算.
解答:
解:(1)(
-
)×40
=
×40-
×40
=35-24
=11;
(2)
×
+
÷
=
×
+
×
=
×(
+
)
=
×1
=
;
(3)5
-
-
=5
-(
+
)
=5
-1
=4
.
| 7 |
| 8 |
| 3 |
| 5 |
=
| 7 |
| 8 |
| 3 |
| 5 |
=35-24
=11;
(2)
| 7 |
| 9 |
| 3 |
| 8 |
| 5 |
| 8 |
| 9 |
| 7 |
=
| 7 |
| 9 |
| 3 |
| 8 |
| 5 |
| 8 |
| 7 |
| 9 |
=
| 7 |
| 9 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 7 |
| 9 |
=
| 7 |
| 9 |
(3)5
| 6 |
| 7 |
| 7 |
| 12 |
| 5 |
| 12 |
=5
| 6 |
| 7 |
| 7 |
| 12 |
| 5 |
| 12 |
=5
| 6 |
| 7 |
=4
| 6 |
| 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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