분수식 변형 1. (1 / 3x + 1 / 5y) / (2x - y) 2. (1 / x) / (1 / y) 3. (- a + b) / (a - b) 4. x / y

분수식 변형 1. (1 / 3x + 1 / 5y) / (2x - y) 2. (1 / x) / (1 / y) 3. (- a + b) / (a - b) 4. x / y

1 (1 / 3x + 1 / 5y) / (2x - y) = [(5x + 3y) / 15] / (2x - y) = (5x + 3y) / [(15 (2x - y)]
2 (1 / x) / (1 / y) = y / x
3 (- a + b) / (a - b) = - (a - b) / (a - b) = - 1
4 x / y = x / y