Предмет: Математика, автор: Аноним

Помогите пожалуйста!!!! Все три!!!

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Ответы

Автор ответа: daraprelj
1

1) 4х-(11,8-х) = 3,8-5х

4х-11,8+х = 3,8-5х

5х+5х = 3,8+11,8

10х = 15,6

х = 1,56

Ответ: А

2) 4+8 = 12 - на столько частей делит угол луч ОС

180:12 = 15° - градусная величина каждой части

15*8 = 120° - градусная величина бо́льшего угла

Ответ: Е

3) По условиям задачи получается следущая фигура:(см.вложение)

Видно,что длина прямоугольника равна 5,а ширина - 3. Получается периметр равен Р = (3+5)*2 = 16

Ответ: А

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daraprelj: почему?
daraprelj: исправила
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