题目内容
脱式计算,能简算的要简算.
36×(
|
|
|
;
|
分析:(1)运用乘法分配律解答;
(2)(3)(4)依据先算第二级运算,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顺序解答.
(2)(3)(4)依据先算第二级运算,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顺序解答.
解答:解:(1)36×(
+
-
),
=36×
+36×
-36×
,
=24+6-27,
=3;
(2)
÷[
×(
-
)],
=
÷[
×
],
=
÷
,
=
;
(3)
×58+42÷8,
=7.25+5.25,
=12.5;
(4)
÷[(
+
)÷
],
=
÷[
÷
],
=
÷
,
=
.
| 2 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
=36×
| 2 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
=24+6-27,
=3;
(2)
| 1 |
| 8 |
| 3 |
| 4 |
| 3 |
| 5 |
| 2 |
| 15 |
=
| 1 |
| 8 |
| 3 |
| 4 |
| 7 |
| 15 |
=
| 1 |
| 8 |
| 7 |
| 20 |
=
| 5 |
| 14 |
(3)
| 1 |
| 8 |
=7.25+5.25,
=12.5;
(4)
| 11 |
| 13 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
=
| 11 |
| 13 |
| 11 |
| 8 |
| 5 |
| 8 |
=
| 11 |
| 13 |
| 11 |
| 5 |
=
| 5 |
| 13 |
点评:(1)正确运用乘法分配律解决问题,(2)正确依据四则运算顺序进行计算是本题考查知识点.
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