Найдите сумму:1) 9/c + 5/c ;2) a/c + 4/c ;3) a/c + b/3c ;4) 1/c +3/2c ;5) d/ac + c/ad ;6)...

$\frac{9}{c}+ \frac{5}{c} = \frac{9+5}{c} = \frac{14}{c}$

$\frac{a}{c} + \frac{4}{c} = \frac{a+4}{c}$

$\frac{a}{c}+ \frac{b}{3c} = \frac{3*a+b}{3c} = \frac{3a+b}{3c}$

$\frac{1}{c} + \frac{3}{2c}= \frac{2*1+3}{2c} = \frac{5}{2c}$

$\frac{d}{ac} + \frac{c}{ad} = \frac{d*d+c*c}{acd}= \frac{d^2+c^2}{acd}$

$\frac{2a}{3c}+ \frac{a}{6c}= \frac{2*2a+a}{6c} = \frac{5a}{6c}$