smj四年级英语
行程问题!7年级SMJ封底里的!~1个回答2022-09-02 02:42
途中汽车转向2次,将时间分为abc3段
设汽车在离校x米处折返,可得一下关系
40a=x
(40+8)b=x-8a
8(a+b)+40c=100
x+8(b+c)=100
要同时到达显然两批人乘车的时间应该相等,即a=c
可以解得a=c=15/8,b=5/4,x=75
共用时t=a+b+c=5小时
所以在11点出发
七下英语11单元答案smj版1个回答2022-11-10 02:06
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七年级英语(外研版新标准)同步检测SMJ(十七) 答案1个回答2022-09-04 04:46
一:biggest better more quicker busiest strict well-behaved gerden wall golden bowl destroies die crying actor return age moved january december married patriotic space reached husband clock finishes orbited last build hero by him quickiy once usual beside about to until late 二:gets didn't get was met are bought don't like did can't doesn't like watched eating cooked was went got cleaned did ate talked sang danced had left to buy watching to do swim is taking 手断了,赏点分吧!!!没功劳,有苦劳!!!!1
招标师证是注册证吗1个回答2024-09-07 06:21
属于职业资格范畴。。
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