1) x: 8 = 15:30, 2)=x/7=5/2, 3) 25: 10 = x:4, 4) 64: 2 = 128 :x, 5) 18/x=3/24 6) 1 1/6 :x=2:3 3/7, 7) (2+x)/5=4/9

Решим пропорции:

1) \( x : 8 = 15 : 30 \) \( x = \frac{15 \cdot 8}{30} \) \( x = \frac{120}{30} \) \( x = 4 \) 2) \( \frac{x}{7} = \frac{5}{2} \) \( x = \frac{5 \cdot 7}{2} \) \( x = \frac{35}{2} \) \( x = 17.5 \) 3) \( 25 : 10 = x : 4 \) \( x = \frac{25 \cdot 4}{10} \) \( x = \frac{100}{10} \) \( x = 10 \) 4) \( 64 : 2 = 128 : x \) \( x = \frac{128 \cdot 2}{64} \) \( x = \frac{256}{64} \) \( x = 4 \) 5) \( \frac{18}{x} = \frac{3}{24} \) \( x = \frac{18 \cdot 24}{3} \) \( x = \frac{432}{3} \) \( x = 144 \) 6) \( 1 \frac{1}{6} : x = 2 : 3 \frac{3}{7} \) \( \frac{7}{6} : x = 2 : \frac{24}{7} \) \( x = \frac{\frac{7}{6} \cdot \frac{24}{7}}{2} \) \( x = \frac{\frac{24}{6}}{2} \) \( x = \frac{4}{2} \) \( x = 2 \) 7) \( \frac{2+x}{5} = \frac{4}{9} \) \( 2 + x = \frac{4 \cdot 5}{9} \) \( 2 + x = \frac{20}{9} \) \( x = \frac{20}{9} - 2 \) \( x = \frac{20 - 18}{9} \) \( x = \frac{2}{9} \)

Ответ: 1) x = 4; 2) x = 17.5; 3) x = 10; 4) x = 4; 5) x = 144; 6) x = 2; 7) x = 2/9

Ты молодец! У тебя всё получится!