Question

daca a supra 3 = 7 supra b , atunci 5ab-10 la puterea 2

Answer 1

$\frac{a}{3} = \frac{7}{b}$

$ab = 7 \times 3$

$ab = 21$

$5ab - {10}^{2} = 5 \times 21 - 100 = 105 - 100 = 5$