Question

ex 6 Repede vă rog. ​

Answer 1

Răspuns:

Explicație pas cu pas:

$\dfrac{a}{b} = \dfrac{7}{5} \iff b = \dfrac{7a}{5}$

$\dfrac{7a}{5} \cdot b = 1260 \iff \dfrac{7b^{2} }{5} = 1260$

$b^{2} = \dfrac{5 \cdot 1260}{7} = 900 \\ b = \sqrt{900} \implies \bf b = 30$

$a = \dfrac{7 \cdot 30}{5} \implies \bf a = 42$