a，b为何值时
   无解?有唯一解?有无穷多解?

A.174.24.96:6088/Latex/latex.action?latex=XGxlZnRce1xiZWdpbnthcnJheX17Y314X3sxfSsyeF97M309LTFcXCAteF97MX0reF97Mn0tM3hf%0D%0AezN9PTJcXDJ4X3sxfS14X3syfStheF97M309YiAgXGVuZHthcnJheX0%3D'

【参考答案】

当a=5，b≠-3时，r(A)=2，r()=3，无解；当a≠5时，r(A)=r()=3，有唯一解；当a=5，b=-3时，......

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