Question

rezolvati ecuatile .

Answer 1

$c) \frac{2}{5}x = \frac{4}{15} \\ \\ \frac{2x}{5} = \frac{4}{15} \\ \\ 2x = \frac{4}{15} \times 5 \\ \\ 2x = \frac{20}{15} \\ \\ 2x = \frac{4}{3} \\ \\ x = \frac{ \frac{4}{3} }{2} \\ \\ x = \frac{4}{3 \times 2} \\ \\ x = \frac{4}{6} \\ \\ x = \frac{2}{3}$

$d) \frac{3}{5}x + \frac{1}{2} = \frac{7}{8} \\ \\ \frac{3x}{5} + \frac{1}{2} = \frac{7}{8} \\ \\ \frac{3x}{5} = \frac{7}{8} - \frac{1}{2} \\ \\ \frac{3x}{5} = \frac{3}{8} \\ \\ 3x = \frac{3}{8} \times 5 \\ \\ 3x = \frac{15}{8} \\ \\ x = \frac{ \frac{15}{8} }{3} \\ \\ x = \frac{15}{8 \times 3} \\ \\ x = \frac{15}{24} \\ \\ x = \frac{5}{8}$

Answer 2

$c) \\ \frac{2}{5} x = \frac{4}{15} \\ x = \frac{4}{15} \times \frac{5}{2} = \frac{20}{30} = \frac{2}{3} . \\ \\ d) \: \frac{3}{5} x + \frac{1}{2} = \frac{7}{8} \\ aducem \: la \: acealasi \: numitor \\ 24x + 20 = 35 \\ 24 x= 15 \\ x = \frac{15}{24} = \frac{5}{8} .$