Упростите выражение:​

(а+3)/(а-1)   +   (а+5)/(2-2а) =  = (а+3)/(а-1) + (а+5)/ -2(а-1) = = (а+3)/(а-1)   -   (а+5)/2(а-1)= =   (2(а+3)   - (а+5))/ 2(а-1)= =   (2а+6 -а -5) /2(а-1)= = (а+1)/2(а-1)   = = (а+1)/(2а-2) 4m/(m²-n²)   - 4/(m+n) = = (4m - 4(m-n) ) /   (m+n)(m-n)   = = (4m - 4m +4n) / (m+n)(m-n) = = 4n/(m²-n²) (2x-y)/(2x+y)   +     y/(4x+2y) = = (2x-y)/(2x+y) +   y/2(2x+y)= = ( 2(2x-y) +y)   /   2(2x+y)= = (4x-2y+y) / 2(2x+y)= =   (4x-y)/ 2(2x+y)   = = (4x-y) / (4x+2y) (x²+y²)/(x²-y²)   -   (x-y)/(x+y) = =(x²+y² - (x-y)(x-y) ) /     (x-y)(x+y) = = (x²+y² - (x² -2xy +y²)) /   (x-y)(x+y) = = (x² +y²-x²+2xy -y²) / (x-y)(x+y) = = 2xy / (x²-y²) 4/(a²-9)     -2/(a²+3a) = = 4/(a-3)(a+3)       -     2/ a(a+3)   = =   (4a -2(a-3))   /   (a(a-3)(a+3) )= =   (4a -2a+6)   /   a(a-3)(a+3) = =   (2a+6)   /   a(a-3)(a+3)   = =   2(a+3) / a(a-3)(a+3) = = 2/ a(a-3)   1/(2m -4)   +   m/(4-m²) =  = 1/ 2(m-2)         -     m/(m-2)(m+2)   =  = (m+2   - 2m)   /   2(m-2)(m+2)   = =   (-m+2) /   2(m-2)(m+2) = =     -   (m-2)/   2(m-2)(m+2) = =   -   1/ 2(m+2) =   = -   1/(2m+4) (4x²+4)/(16x²-9)       - (x²+1)/(4x² -3x) = = (4x²+4) /   (4x-3)(4x+3)         -     (x²+1) / x(4x-3)   = =   (x(4x²+4)   -   (x²+1)(4x -3))   /   (  x(4x-3)(4x+3) )= =   (4x³ +4x   - (4x³ -3x² +4x-3))   / (x(4x-3)(4x+3)) = = ( -3x²   +3 )   /   (x(4x-3)(4x+3)) = =   -     (3x² -3)/   (x (16x² -9 )) =  =   -     (3x² - 3) / (16x³ -9x) b/(3b-1)     +       (3b² -1)/ (1-9b²)   =  =   b/(3b-1)     -    (3b² -1) /   (3b-1)(3b+1)   =  =   (b(3b+1)   - (3b² - 1) ) /   (3b-1)(3b+1) = =   (3b² + b - 3b² + 1) /   (3b-1)(3b+1) = =   (b+1)   /(9b² - 1)