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Ответ:

[tex]x \div 4 = 9 \div 12 \\ 12x = 9 \times 4 \\ 12x = 36 \\ x = 3[/tex]

[tex]x \div 3 = 2 \div 9 \\ 9x = 6 \\ x = \frac{2}{3} [/tex]

[tex]5 \div 3 = x \div 8 \\ 3x = 8 \times 5 \\ 3x = 40 \\ x = 13 \frac{1}{3} [/tex]

[tex]1 \div 4 = 12 \div x \\ x = 4 \times 12 \\ x = 48[/tex]