题目内容
(2004?厦门)递等式计算.
| 1224÷36×25-758 | 132.5-18÷7.5+7.6 | 12-
|
[
|
分析:(1)先算除法,再算乘法,最后算减法;
(2)先算除法,再算减法,最后算加法;
(3)先算除法,再算减法,最后算加法;
(4)先算小括号里面的减法,再算中括号里面的减法,最后算乘法.
(2)先算除法,再算减法,最后算加法;
(3)先算除法,再算减法,最后算加法;
(4)先算小括号里面的减法,再算中括号里面的减法,最后算乘法.
解答:解:(1)1224÷36×25-758,
=34×25-758,
=850-758,
=92;
(2)132.5-18÷7.5+7.6,
=132.5-2.4+7.6,
=130.1+7.6,
=137.7;
(3)12-
+
÷
,
=12-
+
,
=11
+
,
=12
;
(4)[
-(
-
)]×
,
=[
-
]×
,
=
×
,
=
.
=34×25-758,
=850-758,
=92;
(2)132.5-18÷7.5+7.6,
=132.5-2.4+7.6,
=130.1+7.6,
=137.7;
(3)12-
| 2 |
| 7 |
| 1 |
| 7 |
| 1 |
| 5 |
=12-
| 2 |
| 7 |
| 5 |
| 7 |
=11
| 5 |
| 7 |
| 5 |
| 7 |
=12
| 3 |
| 7 |
(4)[
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
| 8 |
| 9 |
=[
| 3 |
| 4 |
| 3 |
| 16 |
| 8 |
| 9 |
=
| 9 |
| 16 |
| 8 |
| 9 |
=
| 1 |
| 2 |
点评:根据题意,先找请运算顺序,然后再进一步计算,能简算的要简算.
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