题目内容
递等式计算
①
-
-
②
-(
-
)
③
-(
+
)
①
| 3 |
| 4 |
| 5 |
| 16 |
| 1 |
| 8 |
②
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 2 |
③
| 7 |
| 24 |
| 3 |
| 8 |
| 1 |
| 16 |
分析:①按照从左到右的顺序计算;
②先算小括号里面的减法,再算括号外的减法;
③先算小括号里面的加法,再算括号外的减法.
②先算小括号里面的减法,再算括号外的减法;
③先算小括号里面的加法,再算括号外的减法.
解答:解:①
-
-
=
-
,
=
;
②
-(
-
),
=
-
,
=
;
③
-(
+
),
=
-
,
=-
.
| 3 |
| 4 |
| 5 |
| 16 |
| 1 |
| 8 |
=
| 7 |
| 16 |
| 1 |
| 8 |
=
| 5 |
| 16 |
②
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 2 |
=
| 5 |
| 6 |
| 1 |
| 6 |
=
| 2 |
| 3 |
③
| 7 |
| 24 |
| 3 |
| 8 |
| 1 |
| 16 |
=
| 7 |
| 24 |
| 7 |
| 16 |
=-
| 7 |
| 48 |
点评:本题考查了分数加减混合运算的计算方法和计算顺序,有括号号就先算括号里面的,没有括号就按照从左到右的顺序计算.
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