Question

помогите пожалуйста )))

Answer 1

2) ab+1/2a + 3-ab/2a = ab+1+3-ab/2a = 4/2a
3) 3x-y/3 +x/4 = 12x-4y/12 + 3x/12 = 12x-4y+3x/12
4) 1/x-3 - 6/x²-9= x+3/(x-3)(x+3) - 6/(x-3)(x+3) = x+3-6/(x-3)(x+3)= -6/x-3