题目内容
(2007?青铜峡市模拟)脱式计算.
67.6÷13+8×2
35÷
×1-
×(
÷
+
)
67.6÷13+8×2
35÷
7 |
8 |
2 |
7 |
5 |
6 |
2 |
9 |
5 |
6 |
5 |
6 |
分析:(1)67.6÷13+8×2,按运算顺序进行计算,先算除法和乘法,再算加法;
(2)35÷
×1-
,先把除法转化成乘法,然后按运算顺序进行计算;
(3)
×(
÷
+
),先算括号里的,再算括号外的,括号内的在运算过程中注意通分.
(2)35÷
7 |
8 |
2 |
7 |
(3)
5 |
6 |
2 |
9 |
5 |
6 |
5 |
6 |
解答:解:(1)67.6÷13+8×2,
=5.2+16,
=21.2;
(2)35÷
×1-
,
=35×
×1-
,
=40-
,
=39
;
(3)
×(
÷
+
),
=
×(
×
+
),
=
×(
+
),
=
×(
+
)
=
×
,
=
.
=5.2+16,
=21.2;
(2)35÷
7 |
8 |
2 |
7 |
=35×
8 |
7 |
2 |
7 |
=40-
2 |
7 |
=39
5 |
7 |
(3)
5 |
6 |
2 |
9 |
5 |
6 |
5 |
6 |
=
5 |
6 |
2 |
9 |
6 |
5 |
5 |
6 |
=
5 |
6 |
4 |
15 |
5 |
6 |
=
5 |
6 |
16 |
60 |
50 |
60 |
=
5 |
6 |
11 |
10 |
=
11 |
12 |
点评:此题重点考查学生对运算顺序的掌握情况,以及对小数和分数四则混合运算的能力.
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