Сколько сантиметров содержится: а) в полуметреб) в четверти метрав) в восьмушкег) в одной пятой метрад) одна сотойе) в восьмидесяти двух сотых метра?

1)0,5 м = 50 см

2)0,25 м = 25 см

3) 1,25 м = 125 см

4)0,20 м = 20 см

5)0,01 м = 1 см

6)1,21 м = 121 см

Пропорция - это верное равенство двух отношений.х : у = 4 : 9                   у : z  = 15 : 2 2/3В первой пропорции у = 9, во второй у = 15. НОК (9 и 15) = 45.45 : 9 = 5 - доп. множ. к первой пропорции 45 : 15 = 3 - доп. множ. ко второй пропорцииВнесём изменения:х : у = (4*5) : (9*5)       у : z = (15 * 3) : (2 2/3 * 3)х : у = 20 : 45               у : z = 45 : (8/3 * 3)  Получаем: х : у : z = 20 : 45 : 8219 : (20 + 45 + 8) = 219 : 73 = 3 - одна частьх = 20 * 3 = 60у = 45 * 3 = 135z = 8 * 3 = 24х + у + z = 60 + 135 + 24 = 219 - сумма трёх слагаемыхответ: х = 60; у = 135; z = 8. 

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