题目内容
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(
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32÷
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分析:根据四则运算顺序,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解答,最后一道依据乘法分配律解答.
解答:(1)
×
+
÷
,
=
+
,
=
;
(2)(
-
÷
)×(1+
),
=(
-
)×
,
=
×
,
=
;
(3)(
+
)×
+
,
=
×
+
,
=
+
,
=
;
(4)32÷
-17.5-2.5,
=40-20,
=20;
(5)
×55+
÷
,
=10+15,
=25;
(6)
+5×
+
×5,
=
×(1+5+5),
=
×11,
=5.
| 1 |
| 12 |
| 3 |
| 5 |
| 1 |
| 3 |
| 5 |
| 12 |
=
| 1 |
| 20 |
| 4 |
| 5 |
=
| 17 |
| 20 |
(2)(
| 5 |
| 8 |
| 1 |
| 4 |
| 5 |
| 12 |
| 2 |
| 3 |
=(
| 5 |
| 8 |
| 3 |
| 5 |
| 5 |
| 3 |
=
| 1 |
| 40 |
| 5 |
| 3 |
=
| 1 |
| 24 |
(3)(
| 2 |
| 3 |
| 1 |
| 4 |
| 3 |
| 11 |
| 3 |
| 8 |
=
| 11 |
| 12 |
| 3 |
| 11 |
| 3 |
| 8 |
=
| 1 |
| 4 |
| 3 |
| 8 |
=
| 5 |
| 8 |
(4)32÷
| 4 |
| 5 |
=40-20,
=20;
(5)
| 2 |
| 11 |
| 3 |
| 5 |
| 1 |
| 25 |
=10+15,
=25;
(6)
| 5 |
| 11 |
| 5 |
| 11 |
| 5 |
| 11 |
=
| 5 |
| 11 |
=
| 5 |
| 11 |
=5.
点评:本题主要考查学生对于四则混合运算顺序,以及乘法分配律知识的掌握.
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