求下列函数中自变量的取值范围:
(1)
;
(2)y=
;
(3)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/031074c021f3bd60f9bf55a9d05046cf.png)
(2)y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5565e05d772e1659f789b12291f3115.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beb61aca7bd7053df541a808aac2b4d.png)
17-18八年级下·全国·课后作业 查看更多[2]
更新时间:2018-03-09 14:53:37
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【推荐1】已知
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(1)求
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您最近一年使用:0次
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【推荐2】一根弹簧原长8cm,每挂重1kg,弹簧伸长0.5cm,且弹簧长度不能超过14cm.设弹簧所挂重物为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac31b3e5f23bf70acbc02d7fe322f69e.png)
(1)写出y关于x的函数关系式及自变量x的取值范围:
(2)当挂重4kg时,求弹簧的长度.
您最近一年使用:0次