Question

решите уравнение 3/5x+2/5x=10 2) (2/3 +5/7x)*21=29 3) 4 1/3x-2 2/5x=5

Answer 1

1) $\frac{3}{5}x + \frac{2}{5}x = 10$

$\frac{5}{5}x = 10$

x = 10

2) $(\frac{2}{3} + \frac{5}{7}x) * 21 = 29$

$\frac{2}{3} + \frac{5}{7} = \frac{14}{21} + \frac{15}{21} = \frac{29}{21}$

$\frac{29}{21}x * 21 = 29x$

29x = 29

x = 1

3) $\frac{13}{3}x - \frac{12}{5}x = 5$

$\frac{13}{3} - \frac{12}{5} = \frac{65}{15} - \frac{36}{15} = \frac{29}{15}$

$\frac{29}{15}x = 5$

$\frac{5}{1} : \frac{29}{15}$

$\frac{5}{1} * \frac{15}{29} = 2,58$