题目内容
金蝉脱壳.
| 3060÷15-2.5×1.04 |
|
|
分析:(1)(2)按照先算第二级运算,再算第一级运算,如果只含有同一级运算,则按照从左到右顺序就是,有括号先算括号里面的顺序解答,
(3)运用减法性质解答.
(3)运用减法性质解答.
解答:解:(1)3060÷15-2.5×1.04,
=204-2.6,
=201.4;
(2)
÷
×
+
,
=
×
+
,
=
+
,
=
;
(3)
×[
-(
-
)],
=
×[
+
-
],
=
×[1-
],
=
×
,
=
.
=204-2.6,
=201.4;
(2)
| 2 |
| 3 |
| 9 |
| 5 |
| 3 |
| 4 |
| 1 |
| 8 |
=
| 10 |
| 27 |
| 3 |
| 4 |
| 1 |
| 8 |
=
| 5 |
| 18 |
| 1 |
| 8 |
=
| 29 |
| 72 |
(3)
| 4 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 4 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 16 |
=
| 4 |
| 9 |
| 7 |
| 16 |
=
| 4 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 4 |
点评:(1)依据四则运算顺序正确进行计算;(2)运用减法性质解决问题,是本题考查知识点,注意计算结果的准确性.
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