题目内容
计算题.
÷(
+0.4)
×
+
×
12÷[(
-
)×
].
| 1 |
| 3 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
12÷[(
| 7 |
| 9 |
| 2 |
| 3 |
| 9 |
| 10 |
分析:(1)(3)根据先算小括号里面的,再算中括号里面的,最后算括号外面的顺序即可解答,
(2)运用乘法分配律解答.
(2)运用乘法分配律解答.
解答:解:(1)
÷(
+0.4),
=
÷1,
=
;
(2)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)12÷[(
-
)×
],
=12÷[
×
],
=12÷
,
=120.
| 1 |
| 3 |
| 3 |
| 5 |
=
| 1 |
| 3 |
=
| 1 |
| 3 |
(2)
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
=
| 3 |
| 4 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
(3)12÷[(
| 7 |
| 9 |
| 2 |
| 3 |
| 9 |
| 10 |
=12÷[
| 1 |
| 9 |
| 9 |
| 10 |
=12÷
| 1 |
| 10 |
=120.
点评:(1)依据四则运算计算方法正确进行计算,(2)正确运用乘法分配律解决问题,是本题考查知识点.
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