题目内容
列式计算.
|
|
(
|
分析:(1)(3)依据四则运算计算顺序,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.
(2)运用乘法分配律解答,
(2)运用乘法分配律解答,
解答:解:(1)
+
×
÷3,
=
+
÷3,
=
+
,
=
;
(2)
÷
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)(
-
)×(
+
),
=
×
,
=
.
| 1 |
| 4 |
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 4 |
| 1 |
| 2 |
=
| 1 |
| 4 |
| 1 |
| 6 |
=
| 5 |
| 12 |
(2)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
(3)(
| 7 |
| 8 |
| 3 |
| 16 |
| 5 |
| 9 |
| 1 |
| 3 |
=
| 11 |
| 16 |
| 8 |
| 9 |
=
| 11 |
| 18 |
点评:本题考查知识点:(1)正确按照四则运算计算顺序进行计算,(2)乘法分配律运用.
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