Question

vă rog repede!!Dau fundă​

Answer 1

$\frac{a}{4} = \frac{3}{b} = > a \times b = 4 \times 3 = > ab = 12$

$\frac{ab}{12} - 1 = \frac{12}{12} - 1 = 1 - 1 = 0$