6. (3x - 5y) dA = ⑦ ，R is the triangle region bounded by the lines y = 5 + x, y = -x + 7, and x = 10.
阿摩線上測驗
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(3x - 5y) dA = ⑦ ，R is the triangle region bounded by the lines y = 5 + x, y = -x + 7, and x = 10.