用克拉默解 \begincases 2x + y = 7 }, {x - 3y = -2 \endcases 。（答： x = 19/7, y = 11/7 。）用克拉默解 \begincases 2x + y = 7 }, {x - 3y = -2 \endcases 。（答： x = 19/7, y = 11/7 。）

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