题目内容
(2013?高台县)
|
[
|
分析:根据分数的混合运算顺序,按照先算乘除,再算加减,有括号的先算括号里面的顺序计算即可.
解答:解:(1)
×[
-(
-
)],
=
×[
-(
-
)],
=
×[
-
],
=
×[
-
],
=
×
,
=
;
(2)[
-(
-
)]÷
,
=[
-(
-
)]÷
,
=[
-
]÷
,
=[
-
]÷
,
=
×
,
=
.
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 4 |
| 16 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 3 |
| 16 |
=
| 8 |
| 9 |
| 12 |
| 16 |
| 3 |
| 16 |
=
| 8 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 2 |
(2)[
| 1 |
| 2 |
| 3 |
| 4 |
| 3 |
| 5 |
| 7 |
| 10 |
=[
| 1 |
| 2 |
| 15 |
| 20 |
| 12 |
| 20 |
| 7 |
| 10 |
=[
| 1 |
| 2 |
| 3 |
| 20 |
| 7 |
| 10 |
=[
| 10 |
| 20 |
| 3 |
| 20 |
| 7 |
| 10 |
=
| 7 |
| 20 |
| 10 |
| 7 |
=
| 1 |
| 2 |
点评:计算分数四则混合运算的题目,要注意运算顺序,通分时要细心,遇到除以一个数,转化为乘以这个数的倒数再进行计算.
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