Объяснение:
3/х^2-1 - 2/x-1= 3/(x-1)(x+1) - 2/x-1 = 3-2*(x+1)/ (x+1)(x-1) = 3-2x-2/(x+1)(x-1) = 1-2x/x^2-1
a) 2a-1/5b + a/b = 2a-1+5*a/5b = 7a-1/5b
Объяснение:
3/х^2-1 - 2/x-1= 3/(x-1)(x+1) - 2/x-1 = 3-2*(x+1)/ (x+1)(x-1) = 3-2x-2/(x+1)(x-1) = 1-2x/x^2-1
a) 2a-1/5b + a/b = 2a-1+5*a/5b = 7a-1/5b