1/(х-1)(х+4) + 1/(х+1)(х+2) = 1/4

1÷(x-1)*(x+4)+1÷(x+1)*(x+2)=1÷41÷(2x+4x)+(-x-4)+1÷(2x+x)+(2x+2)=1÷41÷(5x-4)+1÷(5x+2)=1÷4 _1_ + _1_ = _1_5x-4 5x+2 4