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= (3(a + 1) - a(a² - 1)) / (a(a² - 1))
= ((a + 1)(3 - a(a - 1)) / (a (a + 1)(a - 1))
= (3 - a² + a) / (a(a - 1))
2. 1/(x - 2) + (x + 3)/(x² - 4)
= ((x² - 4) + (x - 2)(x + 3))/ (x - 2)(x² - 4)
= ((x - 2){(x - 2) + (x - 3)}) / (x - 2)(x² - 4)
= (2x - 5)/(x² - 4)
3. 1/(x² - x) + 1/x
= ((x + x² - x)) / (x(x² - x))
= x²/(x(x² - x))
= x / x(x - 1)
= 1/(x - 1)
2) 1 + x+3 = 1(x+4) + x+3 = 2x + 7
x-1 x²-4 (x-2)(x+2) (x-2)(x+2) x²-4
3) 1 + 1 = 1 + 1(x-1) = x
x²-x x x(x-1) x(x-1) x²-x