题目内容
(2012?陆良县模拟)2
×
-1÷1
30100-6087+55998
[1
×0.875+(
-0.6)]÷1
÷1
16×45+99×1001×0-86400÷120
210.5+(6.05-3.35)÷1.5×0.9
[(8
-4.625)÷÷(2.4+1
)]×50%
| 2 |
| 5 |
| 5 |
| 6 |
| 2 |
| 3 |
30100-6087+55998
[1
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
16×45+99×1001×0-86400÷120
210.5+(6.05-3.35)÷1.5×0.9
[(8
| 5 |
| 8 |
| 3 |
| 5 |
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.30100-6087+55998可据凑整法计算.
解答:解:2
×
-1÷1
=
×
-1×
,
=2-
,
=1
;
30100-6087+55998
=30100-6000-87-56000-2,
=56000-6000+30100-87-2,
=50000+30100-87-2,
=80100-87-2,
=80011;
[1
×0.875+(
-0.6)]÷1
÷1
=[
×
+(0.6-0.6)]÷
,
=[
+0]×
,
=
×
,
=1;
16×45+99×1001×0-86400÷120
=720+0-720,
=0;
210.5+(6.05-3.35)÷1.5×0.9
=210.5+2.7÷1.5×0.9,
=210.5+1.8×0.9,
=210.5+1.62,
=212.12;
[(8
-4.625)÷÷(2.4+1
)]×50%
=[8.625-4.625]÷(2.4+1.6)×50%,
=4÷4×50%,
=50%.
| 2 |
| 5 |
| 5 |
| 6 |
| 2 |
| 3 |
=
| 12 |
| 5 |
| 5 |
| 6 |
| 3 |
| 5 |
=2-
| 3 |
| 5 |
=1
| 2 |
| 5 |
30100-6087+55998
=30100-6000-87-56000-2,
=56000-6000+30100-87-2,
=50000+30100-87-2,
=80100-87-2,
=80011;
[1
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
=[
| 8 |
| 5 |
| 7 |
| 8 |
| 7 |
| 5 |
=[
| 7 |
| 5 |
| 5 |
| 7 |
=
| 7 |
| 5 |
| 5 |
| 7 |
=1;
16×45+99×1001×0-86400÷120
=720+0-720,
=0;
210.5+(6.05-3.35)÷1.5×0.9
=210.5+2.7÷1.5×0.9,
=210.5+1.8×0.9,
=210.5+1.62,
=212.12;
[(8
| 5 |
| 8 |
| 3 |
| 5 |
=[8.625-4.625]÷(2.4+1.6)×50%,
=4÷4×50%,
=50%.
点评:本题中的大部分算式由于不能进行简便计算,且数据较为复杂,计算时要细心,注意小数与分数之间的互化.
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