9. = ⑩ , where R is the region bounded by the lines x - 2y = 1, x - 2y = 2, x + 2y = 1 and x + 2y = 3.
阿摩線上測驗
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阿摩線上測驗
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= ⑩ , where R is the region bounded by the lines x - 2y = 1, x - 2y = 2, x + 2y = 1 and x + 2y = 3.