题目内容
脱式计算下面各题:
(1)
|
(2)(
| ||||||||||||||
(3)(
|
(4)1-(
|
分析:依据四则运算顺序,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的顺序解答.
解答:解:(1)
÷
-
,
=
-
,
=
;
(2)(
+
)÷
,
=
÷
,
=
;
(3)(
-
)×(
+
),
=
×
,
=
;
(4)1-(
+
)÷
,
=1-
÷
,
=1-
,
=-2
.
| 18 |
| 35 |
| 3 |
| 5 |
| 2 |
| 3 |
=
| 6 |
| 7 |
| 2 |
| 3 |
=
| 4 |
| 21 |
(2)(
| 1 |
| 6 |
| 1 |
| 2 |
| 6 |
| 7 |
=
| 2 |
| 3 |
| 6 |
| 7 |
=
| 7 |
| 9 |
(3)(
| 3 |
| 4 |
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
=
| 9 |
| 16 |
| 5 |
| 9 |
=
| 5 |
| 16 |
(4)1-(
| 3 |
| 4 |
| 1 |
| 8 |
| 1 |
| 4 |
=1-
| 7 |
| 8 |
| 1 |
| 4 |
=1-
| 7 |
| 2 |
=-2
| 1 |
| 2 |
点评:正确依据四则运算顺序进行计算是本题考查知识点,注意计算结果的准确性.
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