题目内容
计算
(1)
÷
×
÷
(2)6÷
-
(3)(
+
-
)÷
(4)24×
.
(1)
| 3 |
| 10 |
| 2 |
| 5 |
| 9 |
| 11 |
| 15 |
| 22 |
(2)6÷
| 12 |
| 5 |
| 1 |
| 2 |
(3)(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 12 |
(4)24×
| 22 |
| 23 |
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)先把除法变为乘法,约分即可;
(2)先算除法再算减法;
(3)(4)根据乘法的分配律简算.
(2)先算除法再算减法;
(3)(4)根据乘法的分配律简算.
解答:
解:(1)
÷
×
÷
=
×
×
×
=
(2)6÷
-
=
-
=2
(3)(
+
-
)÷
=
×12+
×12-
×12
=6+4-3
=7
(4)24×
=(23+1)×
=23×
+1×
=22
| 3 |
| 10 |
| 2 |
| 5 |
| 9 |
| 11 |
| 15 |
| 22 |
=
| 3 |
| 10 |
| 5 |
| 2 |
| 9 |
| 11 |
| 22 |
| 15 |
=
| 9 |
| 10 |
(2)6÷
| 12 |
| 5 |
| 1 |
| 2 |
=
| 5 |
| 2 |
| 1 |
| 2 |
=2
(3)(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 12 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=6+4-3
=7
(4)24×
| 22 |
| 23 |
=(23+1)×
| 22 |
| 23 |
=23×
| 22 |
| 23 |
| 22 |
| 23 |
=22
| 22 |
| 23 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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