题目内容
脱式计算.
2-
|
|
分析:分数的四则混合运算同整数的四则混合运算一样,先算乘除,再算加减,有括号的先算括号内的;除以一个分数,等于乘这个分数的倒数,即可得解.
解答:解:(1)2-
÷
-
,
=2-
×
-
,
=2-
-
,
=0;
(2)
-(
-
)÷
,
=
-(
-
)×
,
=
-
×
,
=
-
,
=
-
,
=
.
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 6 |
| 13 |
| 26 |
| 9 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=0;
(2)
| 2 |
| 3 |
| 5 |
| 6 |
| 3 |
| 4 |
| 3 |
| 8 |
=
| 2 |
| 3 |
| 10 |
| 12 |
| 9 |
| 12 |
| 8 |
| 3 |
=
| 2 |
| 3 |
| 1 |
| 12 |
| 8 |
| 3 |
=
| 2 |
| 3 |
| 2 |
| 9 |
=
| 6 |
| 9 |
| 2 |
| 9 |
=
| 4 |
| 9 |
点评:此题主要考查分数、整数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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