chrisraptorofficial
14.07.2019 •
Mathematics
Amotorboat takes 3 hours to take a 60 mile trip downstream. it takes 5 hours to make the same trip upstream. let x represent the current and y represents the rate of the boat in still water. the relationship can then be modeled in the graph below. what is the rate of the boat in still water?
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Ответ:
Ответ:
Gọi số tấm thảm xưởng dệt dệt theo dự định là x ( tấm, x >0 )
⇒ số tấm thảm xưởng dệt dệt trong 1 ngày theo dự định x/30 (tấm)
xưởng dệt dệt đc số tấm thảm trong thực tế là x/20 (tấm)
⇒số tấm thảm xưởng dệt dệt trong 1 ngày thực tế là x+20/25 (tấm)
Vì năng suất tăng 25% nên số tấm thảm dệt được trong 1 ngày thực tế sẽ bằng 125% số tấm thảm dệt đc trong 1 ngày theo dự định nên ta có PT : x+20/25=125% * x/30
me lười làm khúc dưới quá nên tự xử nha.