№5. При каких значениях х равенство будет верным? X 8 1)3 = 12 ; 3 18 4 X 2)=303)이외3 15 14 x

Ответ: x = 2; x = 5; x = 36/4 = 9; x = 70/3 = 23 1/3

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

\[12x = 3 \cdot 8\]

\[12x = 24\]

\[x = \frac{24}{12}\]

\[x = 2\]

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

\[18x = 3 \cdot 30\]

\[18x = 90\]

\[x = \frac{90}{18}\]

\[x = 5\]

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

\[9x = 4 \cdot 81\]

\[9x = 324\]

\[x = \frac{324}{9}\]

\[x = 36\]

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

\[3x = 14 \cdot 15\]

\[3x = 210\]

\[x = \frac{210}{3}\]

\[x = 70\]

Ответ: x = 2; x = 5; x = 36; x = 70