Вкуске было 20 м ткани.от него отрезали ткань на 3 юбки и 2 платья.на каждую юбку израсходовали по 1 м 80 см ткани.а на каждое платье -2 м 60 см.сколько ткани ещё осталось в куске?

Пишу по действиям: 1) 1,80×3=5.4(м)-на все юбки 2)2,60×2=5,2(м)- на все платья 3)5.4+ 5,2=10.6(м)-на все плятья и юбки 4)20-10.6=9.4(м)-осталось ответ: осталось 9.4 м в куске

1) 180 см * 3 = 540 см = 5м40см - ткани - израсходовали на 3 юбки 2) 260 см * 2 = 520 см = 5м20 см ткани - израсходовали на 2 платья 3) 20м - (5м40см + 5м20см) = 9м40см ткани - осталось

Anna: hello, is that you, mary? how are you? why yesterday did not go to class? mary: hi anna. i felt bad. and couldn't even get up. a: what happened to you? m: i don't know. i haven't went to the doctor. i had a high temperature. a: can you go to institute today? m: i'm afraid not. this morning i visit the doctor. i feel that i have a few days to stay in bed. really sorry we have to miss lectures. a: nothing to worry about. don't have to come if you don't feel. of course, you need to stay in bed. if you want to borrow my notes. can i visit you today? m: of course. come immediately after lessons. a: i'm sorry, but after school i have to go to the library to get some books for discussion. m: don't go to the library. i have many interesting books. you can take any of them. a: well. i can come to you on the 41 tram? m: yes. but don't come on the tram. near my house opened a new metro station and takes me all of fifteen minutes to reach the institute by metro. a: very well, but i have to go to college. yet. m: see you then. don't forget to bring me your notes. give me a call if you can't come.

6= 2 * 3                               168 : 6 = 28 7 = 1 * 7                               168 : 7 = 24 8 = 2 * 2 * 2                         168 : 8 = 21     нок (6; 7 и 8) = 2 * 2 * 2 * 3 * 7 = 168 - наименьшее общее кратное ответ: число 168.