5 Реши уравнение: 450 1) = 9; x y 2) = 9; 7 9+ a 3) = 23; 9 504 4) = 72 b-18

1. $$\frac{450}{x} = 9$$

   $$x = \frac{450}{9}$$

   $$x = 50$$

2. $$\frac{y}{7} = 9$$

   $$y = 9 \cdot 7$$

   $$y = 63$$

3. $$\frac{9 + a}{9} = 23$$

   $$9 + a = 23 \cdot 9$$

   $$9 + a = 207$$

   $$a = 207 - 9$$

   $$a = 198$$

4. $$\frac{504}{b - 18} = 72$$

   $$b - 18 = \frac{504}{72}$$

   $$b - 18 = 7$$

   $$b = 7 + 18$$

   $$b = 25$$

Ответ: 1) x = 50, 2) y = 63, 3) a = 198, 4) b = 25.