题目内容
(2010?湖北模拟)计算下面各题(能简算的要简算):
2506-10517÷13+14×106
[0.8+0.75×(0.65-0.25)]÷0.01
(4
-1
)÷(
+
)×
1
-2÷(3
×
)÷.0.75+1.32.
2506-10517÷13+14×106
[0.8+0.75×(0.65-0.25)]÷0.01
(4
| 4 |
| 7 |
| 11 |
| 14 |
| 4 |
| 7 |
| 2 |
| 3 |
| 5 |
| 6 |
1
| 1 |
| 3 |
| 3 |
| 5 |
| 5 |
| 9 |
分析:根据四则混合运算的运算顺序和计算法则进行计算即可,注意运算定律的使用.
解答:解:①2506-10517÷13+14×106,
=2506-809+1484,
=1697+1484,
=3181;
②[0.8+0.75×(0.65-0.25)]÷0.01,
=[0.8+0.75×0.4]÷0.01,
=[0.8+0.3]÷0.01,
=1.1÷0.01,
=110;
③(4
-1
)÷(
+
)×
,
=(3
-1
)÷(
+
)×
,
=
÷
×
,
=
×
×
,
=1
;
④1
-2÷(3
×
)÷.0.75+1.32,
=1
-2÷2÷.0.75+1.32,
=1
-1÷.0.75+1.32,
=1
-1
+1.32,
=1.32.
=2506-809+1484,
=1697+1484,
=3181;
②[0.8+0.75×(0.65-0.25)]÷0.01,
=[0.8+0.75×0.4]÷0.01,
=[0.8+0.3]÷0.01,
=1.1÷0.01,
=110;
③(4
| 4 |
| 7 |
| 11 |
| 14 |
| 4 |
| 7 |
| 2 |
| 3 |
| 5 |
| 6 |
=(3
| 22 |
| 14 |
| 11 |
| 14 |
| 12 |
| 21 |
| 14 |
| 21 |
| 5 |
| 6 |
=
| 39 |
| 14 |
| 26 |
| 21 |
| 5 |
| 6 |
=
| 39 |
| 14 |
| 21 |
| 26 |
| 5 |
| 6 |
=1
| 7 |
| 8 |
④1
| 1 |
| 3 |
| 3 |
| 5 |
| 5 |
| 9 |
=1
| 1 |
| 3 |
=1
| 1 |
| 3 |
=1
| 1 |
| 3 |
| 1 |
| 3 |
=1.32.
点评:细心计算,灵活使用运算定律进行简算.
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