问题 填空题 若实数a，b满足(2a-b)2+|9-a2|a+3=0，则a•b=______． 答案 根据题意得，2a-b=0，9-a2=0，a+3＞0，解得a=3，b=6，所以，a•b=3×6=18．故答案为：18．
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