Question

determinati nr a si b stiind ca a, 4 si 12 sunt direct proportionale cu 5, b si 3​

Answer 1

{a, 4, 12} d.p. {5, b, 3}

$\frac{a}{5} = \frac{4}{b} = \frac{12}{3} = 4 \\ a \div 5 = 4 \\ a = 5 \times 4 = 20 \\ 4 \div b = 4 \\ b = 4 \div 4 = 1$