结合运算律,用简便方法计算
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd20d075e2fec9f28de4288c6de5f024.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef87888a4e8fb6a3a319a43c2e51318d.png)
(3)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd20d075e2fec9f28de4288c6de5f024.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef87888a4e8fb6a3a319a43c2e51318d.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd9d80fd8ea0ea30b09dee169475b17.png)
更新时间:2023-10-14 10:50:19
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解答题-计算题
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【推荐2】利用运算律有时能进行简便计算.
例:
.
(1)小明计算
的过程为:原式
.老师判断小明的计算过程不正确,请你写出正确的计算过程;
(2)用运算律简便计算(请写出具体的解题过程):
.
例:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4c8fcd208880f62a80c9395ba8ea1cf.png)
(1)小明计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28e05532278db62dd8f68df39097d8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0be9b21b4dabdedb510ce51955a6d9b.png)
(2)用运算律简便计算(请写出具体的解题过程):
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdfb6f008246041f3401043f708017c4.png)
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