某车间原计划15个小时生产一批零件,后来每小时多生产10件,用了12小时不但完成任务,而且还多生产70件,设原计划每小时生产
个零件,所列方程为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2020-02-03 08:22:22
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【知识点】 其他问题(一元一次方程的应用)
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【推荐1】对于三个代数式
、
、
,(
、
、
中至少有一个含有字母)任意取两个式子的绝对值,再将这两个绝对值求和并使它等于第三个式子,这样形成的等式称为“双绝对值方程”.例如
、
、
(
、
、
至少有一个含有字母)三个式子的所有“双绝对值方程”为:
,
,
.
①若
,
,
组成了“双绝对值方程”,则所有方程的整数解共有
个.
②若
,
,
组成了“双绝对值方程”,则不存在任何一个方程,使其有整数解.
③若
,
,
组成了“双绝对值方程”,则至少存在一个方程,其解有无数个.
④若
,
,
组成了“双绝对值方程”,则所有方程的解只有一个,并且解为
.
以上说法正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5640031fdcff465f598238e608d111c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e25a851e1b53e2328f61b750ef0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1bfa6c04f6947f05dc8f11b328fc636.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7570c77bd375f4dfdffee64fce8d1a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec85f29c0860b57a8f0cf8098c13a97e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7f468c1edd8644b6b92b110db617c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06abf47024c07c7dae08fc7e2d617a60.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564a3336ddeba347978fee32ffb16631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05de636879810855dab27451897e858e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6325939aaac75c6ec74e842251fdd0c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
以上说法正确的有( )
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】中国古代人民很早就在生产生活中发现了许多有趣的数学问题,其中《孙子算经》中有个问题:今有若干人乘车,每3人乘一车,最终剩余2辆车;若每2人共乘一车,最终剩余9人无车可乘.问有多少人?多少辆车?如果我们设有y人乘x辆车,那么下列四个等式:①
;②
;③
;④
.其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3187663cf639aa49f3146cb4fdad4ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d43866b31f0b37db89a57329a0fd7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/becf9dfba2494a8cf0e6ef0ab1d70e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b98db61dcd957ba338a292efed6743e.png)
A.①② | B.①③ | C.③④ | D.①④ |
您最近一年使用:0次