Предмет: Математика, автор: Polinashilenko

Одна бригада асфальтирует за день 1 3/5км дороги а другая используя более производитель нуб технику в 2 1/2 раза больше чем первая.начав работу одновременно и продвигаясь навстречу друг другу ,обе бригады заасфальтировали дорогу между городом и поселком за 10 дней.чему равна длинна этой дороги?

Ответы

Автор ответа: jekadva
0
1 frac{3}{5} *2 frac{1}{2} = frac{8}{5}* frac{5}{2}  =4км асфальтирует вторая бригада в день
1 frac{3}{5} +4=5 frac{3}{5} км асфальтируют две бригады за один день
5 frac{3}{5} *10=56км длина дороги
========
1 3/5=1,6км
2 1/2=2,5
1,6*2,5=4км асфальтирует вторая бригада в день
1,6+4=5,6км асфальтируют две бригады за один день
5,6*10=56км длина дороги
Автор ответа: Аноним
0


1-я асфальтирует 8/5 км в день

2-я асфальтирует 8/5 * 5/2 = 4 км в день

S = 10*(8/5 + 4) = 10 * 28/5 = 56 км

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