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用逆解: \begincases 4x + 3y = 11 }, {2x + y = 5 \endcases 。(答: x = 2, y = 1 。)
用逆解: \begincases 4x + 3y = 11 }, {2x + y = 5 \endcases 。(答: x = 2, y = 1 。)
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