作业帮做过英文的数学题的人来帮我!There were 3100 men and women in a convention hall.If 25% of the men left the hall and 400 women came in,there would be an equal number of men and women in the hall.How many women were there in the convention h
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做过英文的数学题的人来帮我!There were 3100 men and women in a convention hall.If 25% of the men left the hall and 400 women came in,there would be an equal number of men and women in the hall.How many women were there in the convention h
做过英文的数学题的人来帮我!
There were 3100 men and women in a convention hall.If 25% of the men left the hall and 400 women came in,there would be an equal number of men and women in the hall.How many women were there in the convention hall at first
那个方程式还没教呢。我知道题目什么意思额变成加减乘除的等式后是什么样的啊。这里六年级东西教的不多啊。-
做过英文的数学题的人来帮我!There were 3100 men and women in a convention hall.If 25% of the men left the hall and 400 women came in,there would be an equal number of men and women in the hall.How many women were there in the convention h
给你大致翻译下
意思是说有3100个男的和女的
25%的男的走了
400个女的进来了
男的女的人数相等了
求一开始女的多少人
设一开始男的有x人,女的有y人
列方程
x+y=3100
0.75x=y+400
解x,y得
x=2000
y=1100
变成等式是
0.75×3100=2325
2325-400=1925
1925÷1.75=1100
大意：有3100个男人和女人在一个会议中，25%的男人离开了这个会议和400个女人加进了会议，剩下的人中男女人数相等，求原本会议中有多少女人？
计算方法：x+y=3100
3100-0.25x+400=(y+400)*2
答案：1100
首先，先翻译下：有3100名男子及妇女在一个会议厅，如果25％的男人离开了大厅，400名妇女走进来，将有相同数量的男子和妇女在会议厅.一开始会议室有多少妇女。
回答~设开始妇女有X人，那么开始男子为3100-X人
x+400=(3100-x)/(1-25%),
解得X=1100人...
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首先，先翻译下：有3100名男子及妇女在一个会议厅，如果25％的男人离开了大厅，400名妇女走进来，将有相同数量的男子和妇女在会议厅.一开始会议室有多少妇女。
回答~设开始妇女有X人，那么开始男子为3100-X人
x+400=(3100-x)/(1-25%),
解得X=1100人
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