The addition and subtraction of fractions (1) Given a + B = 3, ab = 1, then the value of a / B + B / A is () (2) If x

(1) (a + b) ^ 2 = a ^ 2 + 2Ab + B ^ 2 = 9 divide the left side by AB and divide the right side by 1 to get a / B + B / a = 7 (2) 1 (3) 1, (1 / x-3) + (1-x / 6 + 2x) - (6 / x ^ 2-9) = 1 / (x-3) + (1 / 2) (1-x) / (3 + x) - 6 / (x-3) (x + 3) = - (x ^ 2-6x + 9) / 2 (x-3) (x + 3) = - (x-3) ^ 2 / 2 (x-3) (x + 3) = (3-x) / 2 (x + 3)

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