Question

Aflați termenul necunoscut al priportiei: a) 5/3=15/x b) 2/7=x+1/2x+8.

Answer 1

$a) \frac{5}{3} = \frac{15}{x}$

$x = \frac{3 \times 15}{5} = 3 \times 3 = 9$

$b) \frac{2}{7} = \frac{x + 1}{2x + 8}$

$2(2x + 8) = 7(x + 1)$

$4x + 16 = 7x + 7$

$4x - 7x = 7 - 16$

$- 3x = - 9 \: | \div ( - 3)$

$x = 3$

Answer 2

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