9. (10 points) Evaluate
dA, where R is the region in the first quadrant bounded by lines y = x, y = 3x, and the hyperbolas xy = 1, xy = 3.
阿摩線上測驗
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阿摩線上測驗
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9. (10 points) Evaluate dA, where R is the region in the first quadrant bounded by lines y = x, y = 3x, and the hyperbolas xy = 1, xy = 3.