А)
\frac{10x}{15x^2} = \frac{2*5*x}{3*5*x*x} = \frac{2}{3x}
ОДЗ : x≠0
б)
\frac{2x}{x^2-x} = \frac{2x}{x(x-1)} = \frac{2}{x-1}
ОДЗ: x(x-1)≠0
x≠0; x-1≠0⇒x≠1
в)
\frac{24ax}{18a^2} = \frac{6*4*ax}{6*3*a*a} = \frac{4x}{3a}
ОДЗ: 18*a²≠0
a²≠0
a≠0
г)
\frac{2(x+1)}{x^2-1} = \frac{2(x+1)}{(x-1)(x+1)} = \frac{2}{x-1}
ОДЗ: (x-1)(x+1)≠0
x-1≠0 x+1≠0
x≠1 x≠-1