为了全面提高学生的能力,学校组织课外活动小组,并要求初一学年积极参加,初一学年共有四个班,参加的学生共有(6a﹣3b)人,其中一班有a人参加,二班参加的人数比一班参加的人数两倍少b人,三班参加的人数比二班参加的人数一半多1人.
(1)求三班的人数(用含a,b的式子表示);
(2)求四班的人数(用含a,b的式子表示);
(3)若四个班共54人参加了课外活动,求二班比三班多多少人?
(1)求三班的人数(用含a,b的式子表示);
(2)求四班的人数(用含a,b的式子表示);
(3)若四个班共54人参加了课外活动,求二班比三班多多少人?
更新时间:2020-02-03 19:35:43
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【推荐1】一个长方形的长和宽分别为x厘米和y厘米(x,y为正整数),如果将长方形的长和宽各增加5厘米得到新的长方形,面积记为
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【推荐2】如图是进行小球平抛实验的截面示意图,平台
距
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分米,与
轴交于点
,且
分米.小球(看成点)在
方向获得速度
分米/秒后,从
处向右下飞向x轴,点
是下落路线的某位置,忽略空气阻力,实验表明:
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(分米)与飞出时间
(秒)的平方成正比,且
时,
,
的水平距离是
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,且
分米.
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(1)用含
的代数式表示
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(2)设
,点
的坐标为
,则
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的代数式表示
的横坐标
______,纵坐标
_____;并求
与
的关系式(不写
的取值范围);
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时,求小球与点
的水平距离.
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的距离恰为
分米,已知
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①用含
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【推荐2】已知a、b在数轴上的位置如图
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【推荐2】已知一列多项式:
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【推荐3】为了加强公民的节水意识,合理利用水资源,某市采用价格调控手段以达到节水的目的.如下所示是该市自来水收费价格见价目表.
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每月用水量 | 单价 |
不超出![]() | 2元![]() |
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超出![]() | 8元![]() |
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