题目内容
(2008?门头沟区)脱式计算:
5025-2940÷28×7;
3.68×[1÷(2.1-2.09)];
5-5×
+
;
×[(
+
)÷
].
5025-2940÷28×7;
3.68×[1÷(2.1-2.09)];
5-5×
| 2 |
| 5 |
| 3 |
| 5 |
| 5 |
| 11 |
| 2 |
| 5 |
| 1 |
| 3 |
| 5 |
| 6 |
分析:本题根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:5025-2940÷28×7,
=5025-105×7,
=5025-735,
=4290;
3.68×[1÷(2.1-2.09)],
=3.68×[1÷0.01],
=3.68×100,
=368;
5-5×
+
,
=5-2+
,
=3
;
×[(
+
)÷
],
=
×[(
+
)×
],
=
×[
×
],
=
×
,
=
.
=5025-105×7,
=5025-735,
=4290;
3.68×[1÷(2.1-2.09)],
=3.68×[1÷0.01],
=3.68×100,
=368;
5-5×
| 2 |
| 5 |
| 3 |
| 5 |
=5-2+
| 3 |
| 5 |
=3
| 3 |
| 5 |
| 5 |
| 11 |
| 2 |
| 5 |
| 1 |
| 3 |
| 5 |
| 6 |
=
| 5 |
| 11 |
| 6 |
| 15 |
| 5 |
| 15 |
| 6 |
| 5 |
=
| 5 |
| 11 |
| 11 |
| 15 |
| 6 |
| 5 |
=
| 5 |
| 11 |
| 22 |
| 25 |
=
| 2 |
| 5 |
点评:在完成同时含有中括号与小括号的四则混合运算时,要先算小括号里面的,再算中括号里面的.
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