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方程组 \begincases ax + y = 1 }, {x + ay = 1 \endcases —— a 取何值时(a)有唯一解,(b)有无穷多解,(c)无解?
方程组 \begincases ax + y = 1 }, {x + ay = 1 \endcases —— a 取何值时(a)有唯一解,(b)有无穷多解,(c)无解?
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