题目内容
计算下列各题:
1-
×
;
+
×
;
×(5-
);
×7+
.
1-
| 4 |
| 7 |
| 7 |
| 25 |
| 1 |
| 4 |
| 3 |
| 8 |
| 8 |
| 3 |
| 1 |
| 6 |
| 2 |
| 3 |
| 7 |
| 8 |
| 3 |
| 8 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(2)(4)按照先算第二级运算,再算第一级运算的顺序计算解答,
(3)按照先算括号里面的,再算括号外面的顺序计算解答.
(3)按照先算括号里面的,再算括号外面的顺序计算解答.
解答:
解:(1)1-
×
=1-
=
;
(2)
+
×
=
+1
=1
;
(3)
×(5-
)
=
×4
=
;
(4)
×7+
=
+
=6
.
| 4 |
| 7 |
| 7 |
| 25 |
=1-
| 4 |
| 25 |
=
| 21 |
| 25 |
(2)
| 1 |
| 4 |
| 3 |
| 8 |
| 8 |
| 3 |
=
| 1 |
| 4 |
=1
| 1 |
| 4 |
(3)
| 1 |
| 6 |
| 2 |
| 3 |
=
| 1 |
| 6 |
| 1 |
| 3 |
=
| 13 |
| 18 |
(4)
| 7 |
| 8 |
| 3 |
| 8 |
=
| 49 |
| 8 |
| 3 |
| 8 |
=6
| 1 |
| 2 |
点评:明确运算的顺序并能根据顺序正确进行计算,是此类题目考查知识点.
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