№5. При каких значениях х равенство будет верным? X 8 1)3 = 12 3 18 4 X 2)=303)이외 4) 3 15 = 14 x

Ответ: 1) x = 2; 2) x = \(\pm\)3; 3) x = 36; 4) x = 70

1) \(\frac{x}{3} = \frac{8}{12}\)

\(x = \frac{3 \cdot 8}{12} = \frac{24}{12} = 2\)

2) \(\frac{3}{x} = \frac{18}{30}\)

\(x = \frac{3 \cdot 30}{18} = \frac{90}{18} = 5\)

3) \(\frac{4}{9} = \frac{x}{81}\)

\(x = \frac{4 \cdot 81}{9} = \frac{324}{9} = 36\)

4) \(\frac{3}{14} = \frac{15}{x}\)

\(x = \frac{14 \cdot 15}{3} = \frac{210}{3} = 70\)

Ответ: 1) x = 2; 2) x = 5; 3) x = 36; 4) x = 70