Question

ex 3
dau coroana ,am nevoie repede​

Answer 1

2)

$\dfrac{a}{7} = \dfrac{2}{b} \iff ab=7\cdot2 \implies ab=14$

$3ab - 36=3(ab-12)=3(14-12)=3 \cdot 2 = \bf6$

3)

$\dfrac{x}{y} = \dfrac{2}{3} \implies 3x = 2y$

$\dfrac{3x+2y}{2y} = \dfrac{2y+2y}{2y} = \dfrac{4y}{2y} =\bf2$