公交是一种绿色的出行方式,今年我具开通环保电动公交车.公交车在每天发车前需先将蓄电池充满、然后立即开始不间断运行.为保障行车安全,当蓄电池剩余电最低于20KWh时,需停止运行.在充电和运行过程中,蓄电池的电量y(单位:KWh)与行驶时间x(单位:h)之间的关系如图所示,
(1)公交车每小时充电量为 KWh,公交车运行的过程中每小时耗电量为 KWh;
(2)求公交车运行时,y关于x的函数解析式,并写出自变量x的取值范围.
(3)求蓄电池的电量剩余25%时,公交车运行时间x的值.
(1)公交车每小时充电量为 KWh,公交车运行的过程中每小时耗电量为 KWh;
(2)求公交车运行时,y关于x的函数解析式,并写出自变量x的取值范围.
(3)求蓄电池的电量剩余25%时,公交车运行时间x的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/79c46e79-0920-40cb-a91f-bc424048a56e.png?resizew=298)
更新时间:2021-10-16 20:53:49
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【推荐1】如图,直线
与
轴交于点
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(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95df9c09a491db2a1aab23a6f40aba9.png)
(2)已知点
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【推荐2】对于三个数
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(1)填空:
{
,
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}=
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{
,
,
}=
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{
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(2)如果
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②
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【推荐3】近几年在国家政策的大力扶持及我市果农辛苦努力之下“天水大樱桃”闻名全国,今年又是樱桃大丰收年,一果农带若干千克自产的大樱桃在市场出售,为了方便,他带了一些零钱备用,按市场价售出一些后又降价出售,售出的樱桃千克数与他手中持有的钱数(含备用零钱)的关系如图所示,结合图象回答下列问题.
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(1)该果农自带的零钱是多少?
(2)试求降价前y与x之间的函数关系式.
(3)由表达式求出降价前每千克的樱桃价格是多少?
(4)降价后他按每千克20元将剩余樱桃售完,这时他手中的钱(含备用零钱)是1350元,试问他一共带了多少千克樱桃?
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