5道英语数学题,1）if the price of an item(商品) decrease from(减少) $30

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/17 18:41:39

5道英语数学题,
1）if the price of an item(商品) decrease from(减少) $30 to $24,what is the percent(百分数) decrease in price?
2)what is the ratio(比) of the perimeter(周长) of a pentagon(五边形) with each side(边长) of length(长度) 6 to the perimeter of an octagon(八边形) with each side of length
3)if x,y and z are positive integers(正整数,不为0),and 3x=4y=7z .then what is the minimun value(最小值) of x+y+z?
4）A shop opens at 10:00 am and closes at 6:00 pm.About 100 customers enter into this shop per hour averagely,and about 20 customers will leave the shop per half hour averagely.Then this day,the shop opens at 10:00 am as usual,please count how many customers left in the shop after 9 hours?
5) 17 10又1\4 15又1\4 11又3\4 13又1\2 13又1\4 11又3\4 _____

1）（30-24）÷30=20%
2）5×6：8×5=30：40=3：4
3）3x=4y=7z的最小值是147,此时x+y+z最小,且=28+21+12=61
4）开门9小时后商店里面的顾客人数：100×9-20×2×9=540
5）
再问：第五题是多少？
再答：还没看出来
再问：看出来了吗？我想了很久都没想出来，拜托了！
再答：你第五题的题目没写错吗
再问：没有写错，对了，我不能再追问了，否则就要花财富值了，要说就一次说完吧。

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