Предмет: Математика, автор: hhgnhhj

2 вариант плизз!!))Буду очень рада и благодарна

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Ответы

Автор ответа: lerka7cat
0
номер 1 а) -1 ''''''
Автор ответа: hhgnhhj
0
и?
Автор ответа: allegefickt
0
Вариант N2

1. а) -3x - 2 = 5x + 6
    -3x - 5x = 6 + 2 
     -8x = 8
      x = - 1

  б) -2x - 1,4 = 6x - 3 
     3 - 1,4 = 6x + 2x
     8x = 1,6 
     x = 0,2
 
2.        5            6
       --------- =  ---------
        x - 3        - 13
       6x - 18 = - 65
       6x = 18 - 65
       6x = - 47 
        x = -  frac{47}{6}
        x= 7  frac{5}{6}
3.   
  B  _ _ _ _ _ C               Дано:
      |            |               ABCD - прямоугольник
      |            |               AB = 8 + BC
      |            |              AB = BC - ?
      |            |
 A   | _ _ _ _ | D

Решение.
Пусть BC = x. Тогда, AB = 8 + x. Зная, что если увеличить AB на 6 и BC на 10, то мы получим равные отрезки =>
AB = 6*( 8 + x)
BC = 10x
AB=BC
6*( 8 + x) = 10x
48 + 6x = 10x
4x = 48
x = 12
Проверяем
AB = 6*(8+12) = 6*20 = 120
BC = 10x = 10*12 = 120 
Что и требовалось доказать

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