Two tames need 18 days to complete an engineering taks.Tame A have worked 3 days.Tame B have worked 4days.They have finished one fifth of the task.If team A complete the task by them selves they need ( )days.
来源:学生作业学帮网 编辑:学帮网 时间:2024/05/28 08:16:25
Two tames need 18 days to complete an engineering taks.Tame A have worked 3 days.Tame B have worked 4days.They have finished one fifth of the task.If team A complete the task by them selves they need ( )days.
答案:36 (days).
假设:总任务量为1,team A的工作速度为a/天,team B的工作速度为b/天,则据题意就有:
18×(a+b)=1
3a+4b=1/5
求解上述方程得到:a=1/45;b=1/30.
当team A独自完成剩余4/5任务时,据题意就有:4/5÷1/45=36 (days).
gkg
生是中国人,死是中国魂,想我看英文,简直不可能@
Two tames need 18 days to complete an engineering taks.Tame A have worked 3 days.Tame B have worked 4days.They have finished one fifth of the task.If team A complete the task by them selves they need ( )days.
Time tames the strongest grief.是什么意思
I need two slice of bread改错
__ honey do we need?two
____I____exercise two hours every day.(do),(need)
用need two kilo rice造句
i need two teaspoons[ ] salt括号里填啥.
Clean you clothes need two days
We need two teaspoons of honey.(对two提问)
对划线部分提问:we need two apples(two)
What da you need to take what da you need to take @#¥%……&*()——+{}:“|《》?
da
da
Here are three mangoes.Do we need _______?A.other two B.two another C.more two D.two more
two pen a books need i and组成句子
I need there are some () between these two books.(区别)
we need (two cups)of yogurt对括号里提问
We still need two ___ (many) students to help us.