|A| = -(a+2)(a-1)^2
所以 a≠1 且 a≠-2 时方程组有唯一解
a=1时, r(A) = r(A,b) = 1 < 3, 方程组有无穷多解
a=-2时, r(A)=2, r(A,b)=3, 方程组无解.
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