Divide: 3xx−1÷9x2x2−1\dfrac{3x}{x-1} \div \dfrac{9x^2}{x^2-1}x−13x÷x2−19x2.
x+13x\dfrac{x+1}{3x}3xx+1
3x(x+1)x−1\dfrac{3x(x+1)}{x-1}x−13x(x+1)
x−13x\dfrac{x-1}{3x}3xx−1
13x\dfrac{1}{3x}3x1