先化简,再求值
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b369c8bb5c7b6a6dcafbe0634f806736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3053399d2f91ca2f7dda29e7c5d64397.png)
更新时间:2023-12-26 12:41:40
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【知识点】 数与式
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解答题-问答题
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较易
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【推荐1】居民生活中使用天然气实行阶梯式计价,用户每月用气量在
立方米及以内的为第一级基数,按一级用气价格收取;超过
立方米且不超过
立方米的部分为第二级气量基数,按一级用气价格的
倍收取:超过
立方米的部分为第三级气量基数,按一级用气价格的
倍收取.为节约用气量,小明记录了
月份他家每月
号的气表读数.
(1)直接写出小明家
月份的用气量____________立方米及
月平均每月用气量为_______立方米.
(2)已知小明家
月份的气费为
元,试求他家
月份需交气费多少元?
(3)
月份放暑假后,小明的爷爷、奶奶及表哥来到家里和小明一起生活,并多次请客,用气量明显增加,比
月份多用气
立方米,试求小明家
月份需交纳气费多少元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5af1a926e6394df85a96d499a380be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5af1a926e6394df85a96d499a380be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f0b6bafb5a320b75a1b0803a4490f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38e8c45f33c7d9f36ce49d92faefb0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f0b6bafb5a320b75a1b0803a4490f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22cd136a63a7bff9dabdba34b2b71e63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6b0ed7e51697d1cf8cc346c91f855c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414656636a840bbb9a031d6103239fdd.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | |
气表读数(立方米) | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414656636a840bbb9a031d6103239fdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc9e15aaf52b274bfc42c154affc4c1.png)
(2)已知小明家
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9880952857950577055578875ab29141.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5fbf3b8609a2727385a46233e7fcb3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b632e7f3193aacab40ef3c9a9d69d7a0.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218c8fb59a52d65cb9c81ddf1fe286c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b632e7f3193aacab40ef3c9a9d69d7a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d4f27942305839ca012496546bc3a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218c8fb59a52d65cb9c81ddf1fe286c1.png)
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