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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