题目内容
| 算一算. 2×
|
|
5÷(
| ||||||||||||
12÷(
|
|
30÷
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(2)(6)按照从左到右的顺序计算;
(3)(4)(5)先算括号里面的,再算括号外面的.
(3)(4)(5)先算括号里面的,再算括号外面的.
解答:
解:(1)2×
÷
=
×
=
;
(2)
×2×
=
×
=
;
(3)5÷(
×
)
=5÷
=5×
=7;
(4)12÷(
÷
)
=12÷(
×4)
=12÷
=24;
(5)
÷(
÷
)
=
÷(
×
)
=
×
=
;
(6)30÷
÷14
=30×7÷14
=210÷14
=15.
| 1 |
| 6 |
| 5 |
| 8 |
=
| 1 |
| 3 |
| 8 |
| 5 |
=
| 8 |
| 15 |
(2)
| 3 |
| 8 |
| 1 |
| 12 |
=
| 3 |
| 4 |
| 1 |
| 12 |
=
| 1 |
| 16 |
(3)5÷(
| 6 |
| 7 |
| 5 |
| 6 |
=5÷
| 5 |
| 7 |
=5×
| 7 |
| 5 |
=7;
(4)12÷(
| 1 |
| 8 |
| 1 |
| 4 |
=12÷(
| 1 |
| 8 |
=12÷
| 1 |
| 2 |
=24;
(5)
| 5 |
| 6 |
| 4 |
| 7 |
| 9 |
| 14 |
=
| 5 |
| 6 |
| 4 |
| 7 |
| 14 |
| 9 |
=
| 5 |
| 6 |
| 9 |
| 8 |
=
| 15 |
| 16 |
(6)30÷
| 1 |
| 7 |
=30×7÷14
=210÷14
=15.
点评:分数乘除混合运算,把除法改为乘法后约分计算得出结果.
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