А) a+4/4a - a-2/a^2= (a + 1)/(4a) - (a-2)/a^2= ((a+1)a - 4(a-2))/(4a a^2)= (a^2 + a - 4a + 8)/(4a^3)= (a^2 - 3a + 8)/(4a^3)
б) 3x/x+3 + 3x/x-3= 3x/(x+3) + 3x/(x-3)= (3x(x-3) + 3x(x+3))/(x+3)(x-3)= (3x^2 - 9x + 3x^2 + 9x)/(x^2 - 9)= 6x^2/(x^2 - 9)
в) 9x^2/3xy-y^2 - y/3x-y= 9x^2/(3xy - y^2) - y/(3x - y)= 9x^2/[(y)(3x - y)] - y/[(3x)(3 - y)]= [9x^2 - y(y)] / [y(3x - y)(3 - y)]
г) a - 3b + 6ab/(a-3b)= (a - 3b + 6ab)/(a - 3b)= (ab + 6ab - 3b)/(a - 3b)= (7ab - 3b)/(a - 3b)
А) a+4/4a - a-2/a^2
= (a + 1)/(4a) - (a-2)/a^2
= ((a+1)a - 4(a-2))/(4a a^2)
= (a^2 + a - 4a + 8)/(4a^3)
= (a^2 - 3a + 8)/(4a^3)
б) 3x/x+3 + 3x/x-3
= 3x/(x+3) + 3x/(x-3)
= (3x(x-3) + 3x(x+3))/(x+3)(x-3)
= (3x^2 - 9x + 3x^2 + 9x)/(x^2 - 9)
= 6x^2/(x^2 - 9)
в) 9x^2/3xy-y^2 - y/3x-y
= 9x^2/(3xy - y^2) - y/(3x - y)
= 9x^2/[(y)(3x - y)] - y/[(3x)(3 - y)]
= [9x^2 - y(y)] / [y(3x - y)(3 - y)]
г) a - 3b + 6ab/(a-3b)
= (a - 3b + 6ab)/(a - 3b)
= (ab + 6ab - 3b)/(a - 3b)
= (7ab - 3b)/(a - 3b)